I just learned more in eleven minutes about an automatic transmission than I have learned in all of the previous years combined! Thanks for tying up loose ends of knowledge I have about this subject and making it one complete thought process.
Thank you for a very simple explanation of how a transmission works. I've spent 25 years working with engines at GM and have just transferred to a transmission group. A whole new animal and I was lost. Thanks again.
You did an amazing job describing the inner workings of an automatic transmission. I know alot of people wont even touch em. From rebuilding tranmissions auto / manual myself, you were rate on the money 100%. Great video keep up the good work.
Your explanation of how an automatic transmission works was amazing. I have a greater appreciation for how my car works, and for my mechanic! Very well explained. Thank you for taking the time to teach us.
well this is much more complicated than I expected thanks for explaining beyond the gear ratio aspect of automatic transmission and going into what actually makes it automatic
Matticus. This is the best video I have ever seen on how an automatic transmission works. I really appreciate your work on this. Explaining the steels and the clutch plates, and an explanation of valves and check balls was essential in tying what I already know about transmissions into a coherent thought process. :D Thanks
Thank you Matt. I was having a hard time studying for my ASE transmission test, the info in the study guides would not stick in my head due to the boring presentation in the guide, but this helped put the words from the pages into something I could relate to better.
Wow, thank you for making this video, I watched many other videos to try and understand but none of them explained it as well or a simply as you, thank you so much. I genuinely appreciate that you took time out of your life to make this video. Thank you and God bless.
despite the editing errors you mentioned, i've come away with a better understanding of how autos work than even the most complex animation videos. Kudos.
I've always heard of how automatic transmissions use hydraulic pressure, but seeing the tubing is mind-boggling. I work in software yet the idea of a liquid-based circuit seems almost alien. Thanks for this informative video!
I started to look for some good explanation on AT woking principle after my KIA Canival AT broke down . . just fixed in a reconditioned AT unit . . I just want to say . . ' You explanation is the best . . '
THANK YOU SO MUCH! This is the only video that my dumb self could understand lol. I understood the planetary gears but I didn't know how the transmission held each in place. Great video man.
good day I live down in the Bahamas and really learning a lot from your videos. I'm working on a 2004 jag X-type (JF506E). I chance the fluid in it to Max-life and now it's not taking reverse. no I didn't take out the band anchor bolt. just chance the fluid. after getting no reverse I opened it to find the band broken. I chanced it out and still no reverse. at idle I'm getting 95psi at the Reverse Clutch Pressure Tap. I never adjusted the SERVO PISTON. thank you so much for your help
Pfew, never knew an automatic transmission was this complicated. You have to got an academic degree to undertand it. Thank you for the clear explanation.
Thank U so very much Matts, we appreciate your time & effort, thanks for showing the real thing, & very well explained in theory as well. You reminded me of small Anakin (Jedi). Cheers & enjoy the good work :-)
Brilliant video... Thanks I need some expert advice, My 1991 vw selects gears after 3800rpm, could the throttle cable be causing the problem.? Or would the cause be something more serious?
It is very difficult to say. The best bet would be to hook a pressure gauge up to it to measure line pressure. I made a video on how to do this. However you will need to have the specs on hand from the factory service manual to see what the pressures should be.
Ezequiel Quiroz First, try to find a PDF version of it for free on the internet. Many times you will be able to do this. If that doesn't work, try ebay. Finally, if you're really not having luck, go to the dealer.
Sage Radachowsky Glad you enjoyed the video! Most modern torque converters are locking. What this means is, when your car reaches a certain speed, there is a clutch inside the torque converter that engages and mechanically locks the impeller and the pump together. This means that the engine is also mechanically locked to the transmission instead of through a fluid coupling. This is done because there are losses in transferring power through fluid, so to be more efficient, the fluid clutch is eliminated when it is not needed.
These things are so incredibly complex that it makes it difficult to explain how it works in a way that is easy to understand. There's just so much going on, it's a wonder that they are as reliable as they are.
Your explanations of the automatic gearbox are excellent. However, I am now trying to find out how the AGS (Automatic Gear Shift) type of gearbox functions. I have just ordered a Suzuki Celerio SZ4, 988cc, 3 cylinder, petrol, with AGS (Automatic Gear Shift). Apparently, this car has a standard manual 5 speed gearbox, which has an electroncally controlled cluch (no cluch pedal). I took one for a test drive justerday and it has a auto type selector (D, N, R) but the lever can be pushed to the left and then, by pushing the lever forward, then release, then forward again and so on it goes up through the five gears. Similarly, to shift down the gears, pull (tap) the lever backwards each time another lowe gear is required. I was quite impressed but the sales team could not tell me how it actually works. Other than that, I can find no further information. I would be very greatful if you could point me in the right direction to find detailed information about this type of transmission operation. Thank you in anticipation, Alan Parsons (alanpars@gmail.com).
How to the clutches engage? You mentioned a piston, but when I think of piston, I think of something like a slug in a cylinder. To apply even pressure around the clutch pack, the piston would need to be shaped like a ring?
hey hiram, I loved the video! thanks for such detailed explanation! I am having a problem with my 1-2 shift on my hydramatic 125. the car stopped doing a 1-2 shift suddenly.. what can this mean?
akshay ramachandran I'm not hiram! Lol That problem can be caused by many things. You would need to take some pressure readings to get an idea of what is happening inside the transmission.
Very informative! But is it normal that my car makes a single click noise when I put it in reverse and back to Drive? Just bought a year old car and I wanna make sure it is normal lol.
bleuflamenco Have Fun With All That Shifting And Beating The Thing And Getting That Right Hand/Arm And Left Leg/Foot Workout And All That Labor! I Love My Geo Metro Automatic Just The Same. I Don't Care If I Sacrifice 10 Or So MPG, Shifting Gets Old After So Long, lol.
hi excellent video. I have a 125c transmission equal to your video as I can get the technical manual that shows there I would like to get it, I'm from Mexico. can you give me information I thank you greetings
Hello gentleman, seems you are pretty expert in automatic transmission, so i would ask you something about my w5a580. Well a 2007 Dodge nitro purchased as brand new car on 2008, he is pretty good any problem till today. Just He has always made a tweeting noise since from 2007, during cold season only never during summer. Noise happen when releasing throttle and car is running due its inertia or when no throttle descending from hill. As example if i'm driving at 60 mph, and fully release throttle, this noise appear with car continue to run, if i press again on throttle noise disappear. Also it happen in 3rd 4th and 5th gear only never with 1st and 2nd engaged. Same way if car is running with that noise and i put in neutral noise disappear. No happen during stop. I'm nut sure that is transmission, any idea? Thanks chris
Awesome explanation. I used to think there is no clutch disk inside automatic transmission and looks like I was wrong. So do I need to change out the clutch disks after a certain period of driving due to wear, like what we do with manual transmission?
No you don't. The clutch disks are not a regularly serviceable item and require the complete disassembly of the transmission to replace. However that doesn't mean that they won't wear out. When they start wearing out, the transmission starts slipping and a transmission overhaul (or rebuild) is required to correct the issue. All rebuild kits come with new clutches and steels.
Not really! I've only been working on cars for a little over 3 years. But I have literally been OBSESSED with cars in that time. I have read many text books on transmission operation and engineering and also automotive engineering. But at the end of the day, the name of the game is experience. Which I have gotten a lot of in this short amount of time. It is hard to describe what it feels like when clutches start to slip. But you will know something is wrong trust me!
MattsMotorz I was obsessed with cars when I was in high school but I wasn't into it that deep like you, and I do realize that car = $$$ unless one works on cars for living. About how long does it take until the clutch in auto transmission worn out?
It varies greatly depending on which transmission it is. Under normal operating conditions, I have seen transmissions last over 200,000 miles with no problems. However, the most common cause for clutch failure is overheating. So if you take care of it, then it will last awhile!
This is a great video. I have a Jeep Wrangler, 97, with 38RH transmission that was just rebuilt. I drive it for a while and it works fine but later when I come to a full stop it starts back out in second, not first. If I put it in park or down to low I get first, but not when I stop my speed to zero. So the shop said it was a governor issue and kindly replaced it. Just got it back today and it worked great. Second time I went out within twenty minutes its doing same thing again. How many times can I keep taking it back? Is there something wrong they might have done wrong in the rebuild or is this just a governor issue? They did a full rebuild, one of the gear sets was broken. I wish your shop was near me, I'd bring it in, but any help is much appreciated. Thanks
archivestereo Unfortunately, automatic transmission problems are a very complex subject. There could be a number of reasons why this is happening, but without being able to diagnose it myself, there isn't any useful information I can give you over the internet. :\ However, I can advise you to continue to take it back until it works! They are responsible for making sure the repair was done correctly.
Hi good evening every body , Your explanation of automatic transmission are good one / excellent. I am trying to find out how the AGS type of gear box function i want to know why automatic gear box not proved in diesel vehicle (Special for MARUTI SUZUKI) ,and what is reason for behind it . Already proved in petrol vehicle .......Ple reply...........
Thanks for the great video. What make model did this transmission come from? I have a 94 Chevy g20 van. Since I bought it (3 years ago, 46k) till now (71k miles) it has NEVER shifted into first gear. It drives pretty well though, no slippage in the other gears, and I can pretty much start on even the steepest hills in 2nd. The fluid is pretty dirty, and has kind of a burnt smell, but other then that its kind of amazing to me that it has gone 25k miles easily and drives great. From my understanding in this video it sounds like one potential cause of this problem is a bad shift valve?
+Lower 9th Wardermelon This came out of a 98 Chevy Cavalier. It greatly depends on the transmission. I am not familiar with the transmission in a 94 Chevy G20 Van. While all automatics generally work the same way (except the CVT's), they still vary greatly on how they do it. The list of possible causes is too great for a comment on youtube without some sort of diagnostics such as line pressure tests.
Thank you very much for this video.I appreciate for your sharing knowledge.Sir.Please let me know the book`s name that you explain the valve body diagram.
Saw Tun Thanks for watching! The book I am using is the factory service manual for that particular transmission. Every factory service manual has these diagrams. But if you want to read more about how an automatic transmission works as well as how these diagrams work, get the book "Automatic Transmissions and Transaxles" by "Jack Erjavec." It is part of the "Todays Technicians" Series. It's very good!
Thank you so much.Sir. I`m trying to understanding automatic transmission work and valve body and sensor..Now I`m learning to rebuild auto transmission but I don`t understand how auto transmission change the power and how valve body control the fluid pressure and which sensor , which solonoid they use.Can you give me any advice to do better?
+Saw Tun . I`ve already bought the books that you recommended . Can you help me to get the right answers of multiple choice ,ASE review questions and ASE challenge questions.. I had bought 4th edition shop manual ,5th edition shop manual and 3rd edition classroom manual.
Great Video! I have a question for you! I have a 88 cherokee with an AW4 transmission. The mechanic said is a very good transmission and that is also used in a lot of toyota cars. Is that true? I wanted to overhaul it because I think is a very reliable car.. Never done anything to the trasmission until now with 146,000 miles on it. Greetings from Costa Rica and thanks for your comments.
Hello! I cannot verify what he says, I never worked on that transmission. If the transmission is still good, I would advise to not overhaul it, as there is no reason to at this point.
This transmission is indeed a 3 speed but not just because of that one planet assembly. This unit actually has three planetary gear sets (if you count the one on the differential). They chain them together to obtain different gear ratios.
simple n clear explanations. i have some ?? at stop or totally stationary. 1.) will the planetary gear rotate as i step on the brakes. 2.) the contact area, where the clutch bend clamp down is it rotating at stationary with the brakes apply? correct me if i am wrong. if the the area where the clutch bend claims down is always rotating. means it vry hi wear to the clutch bend. am i correct? hope u can help me out. thx matt.
When you are stepping on the brakes and the car is stationary, nothing inside the transmission is moving (in terms of gear sets and drums and the like) except the torque converter. The fluid in the torque converter will be trying to spin the input shaft of the transmission, but since you are stopping the wheels from moving, the fluid will simply keep spinning around. This allows the engine to turn at a standstill without stalling the engine.
I am highly opposed to any kind of aftermarket additive which make claims to offer very cheap repair solutions to complex problems. There are a number of transmission anti-slip products out there which claim to repair slipping transmissions. I haven't ever used them, but from what I hear and from what I know about these kinds of products, I would say they don't work. In many cases, these kinds of products can do much more harm than good, such as stop-leak.
MattsMotorz I had a ford escape (cd4e transmission) that would slip every time it came out of overdrive. I did a transmission fluid change and added in some Lucas oil stop slip. It didn't slip anymore after that. But that's just my experience
+Nguyen Minh Thanks! The book I was using is the factory service manual for the particular transmission in the video. Every transmission has one. If you want a good book on automatic transmissions, look up "Today's Technician Automatic Transmissions and Transaxles."
The other day I came to a stop quickly. The car didn't fall back into 1st gear. It fell out of gear. When I placed my foot on the gas the car snapped into first and the car lurched forward. Sooooo, does that mean the band or clutch discs stayed compressed or that pressure stayed in the port to first?
To me it says there was loss of pressure in the circuit that controls downshifting to first gear and the clutches / whatever is used were not able to keep the transmission in gear. When you stepped on the gas, that caused the pump to spin faster, increasing the pressure and allowing the transmission to clamp into gear. First thing that comes to mind is the transmission is low on fluid. Check that first.
I guess (still learning this stuff), an auto transmission is a function of speead and acceleration, whereas a manual transmission is a function of observing the rpm and INTENT to accelerate. An auto transmission only switches gears up at that point where rpm redlines, I suspect. For how else would you program that "infernal thing"? : My guess, it is designed around a car travelling, accelerating, decellerating, on a straight line track, or did engineers take into account turns and slopes too?
This is a good question. The way they do it is to take into account what the driver wants to do. But how do they know what the driver wants to do? Simple, measure the throttle plate position. For example, if you are going up a slight hill, and keep the pedal still, your RPM's will go down. However many times this decrease in RPM isn't enough for the transmission to warrant a downshift. It will only downshift when the driver wants more power, namely, when the driver steps down on the pedal more. So the computer is constantly shifting based on many economic and efficiency factors, while also taking into account the wishes of the driver (based on pedal position). As for sharp turns and such, typically the car slows down to negotiate the turn, so this decrease in speed and load, as well as pedal position causes the computer to downshift. It all makes sense if you think about it enough. Hope I explained it half way decent and understood your question. It is very clever. This is the reason why I do not like automatics as much as manuals. An automatic wont downshift until you have stepped on the pedal and the computer realizes "oh hey, he wants to accelerate! Better down shift!" Where as in a manual, one can downshift immediately with no wait. After driving a manual for years, an automatic feels slow and "mushy" when it delivers power.
i have a question, i would be very grateful if you could give me some advise. I have an automatic '96 Chevrolet Blazer and when i shift gear from Park to Reverse it sometimes emits a noise like if something gets hit, this also happens from Neutral to Drive. But this noise never happens while the car is moving, all the shifts come smoothly.
Does it "slam" into gear? Meaning, does the whole car "clunk" when you shift into drive or Reverse? Is it more noticeable when cold? Does it do it when the car is at operating temperature?
MattsMotorz yes it does slam into gear, it's like if the car wants to move a bit from the force but my foot is on the brakes. And it doesn't appears to be a difference doing it in cold or operating temp.
Is that vehicle front wheel drive with a transverse engine? If it is, many times this is caused by a stretched or worn drive chain inside the transmission. If it isn't then usually this kind of thing happens when transmissions get older. It could be many many things, little of which could be fixed unless the transmission is rebuilt. Making sure the CORRECT fluid is in it and at the proper level would be a good start.
MattsMotorz it has a RWD and a longitudinal engine, the fluid and level are correct, but the trans is quite old =/ ... tomorrow i will get it checked to see what's the real reason. Thanks for your help :)
My car (1995 Honda Civic Automatic) has a problem for which I'd like to narrow down the exact cause inside the transmission: The car, while standing and holding down the brake pedal in D, suddenly loses Revs and wants to make a move (switching to first gear?). I have to step off the brakes and push them again in order to prevent the engine from going off. This happens quite often now standing in a queue of cars (stop and go). What is exactly going on inside the transmission? Can this be due to wrong transmission fluid put in 2 years ago (car has no climbing problems and changes gears fluently while moving). Thx in advance for replies.
I am not sure what exactly you mean by "wants to make a move." But to me, this sounds like an engine problem, not transmission. Many times when the engine bogs down during idle it is caused by a vaccum leak such as a stuck open idle air control valve.
MattsMotorz Hey, many thx for the reply. The car came back from a friend (car mechanic). He only found the car doesn't accelerate well and suggests to change the transmission. Actually this car never really performed outstandingly well. Matts, I'm just a beginner with cars but could you please (if not to busy) find out if my Honda (1996 saloon, not 1995, CIVIC 1493cc, 4 Cylinders) has a partially electronically controlled transmission? The speedmeter doesn't work from time to time and I was driving the car usually even with the Error light on, because I found no trouble doing so. Now I read that a faulty speed sensor can cause symptoms that let even specialists believe that the transmission must be replaced. When the speedometer needle works I experience normal operation as far as I remember. So, simple question: Is my transmission depending on optimal feedback of the speedsensor? Thx for the help, man!
For a 1996 Honda civic, the transmission IS electronically controlled. I know this because I rebuilt one (I have a video series on it, the name of the transmission found in many civics that year is A4RA). A bad speedometer, input or output speed sensor can cause the transmission to not work properly, but as I said before, what you described to me sounds like an engine problem. Try checking the idle air control valve. I made a video showing how to do this. Also check for vacuum leaks. Also, what does your mechanic friend mean by "does not accelerate well." Is the transmission shifting too late? Is it slipping? That seems like too vague of a description to justify replacing the trans. I would get a second opinion.
MattsMotorz Sorry for the late, late reply. I felt I should give you an update to how I finally got rid of the problem. After I unplugged the speed sensor the issue vanished. Engine runs smoothly while standing on brakes. It seems the sensor gave false data about my current speed. I didn't do anything on the engine, neither I let anyone service the car. Until now the issue never came back. So, why would I bother buying a new sensor(most probable a used one since a new one would not be worth it considering the age of the car)? The car runs perfectly without it!? Even Economic, Normal and Sport mode are operating. Can I damage s.th. not using the Speed Sensor?
Glad to hear your figured out the problem!! The best thing to do would be to get a new sensor. The speed sensor is pretty important in a lot of systems on the car. I would wager that your car is in "limp home" mode and is using pre-programmed characteristics instead of taking live data from the sensors. This is what can happen when sensor signals go missing. You can get a new speed sensor for about 60 bucks at rockauto.com I believe it would be worth it if the car is in good shape and will last awhile.
Hey matt, loved the video! Is there an easy way to tell the difference between a mechanical problem and an electrical problem with the transmission still in the car? My 2002 Dodge Neon will not shift out of first gear. It is an intermittent problem that can last for days at a time. I have a trouble code for: Incorrect gear ratio 1 and 2, speed sensor circuit malfunction, fluid pressure switch, and shift solenoid malfunction.
Based on what you tell me, it sounds like your problem is an electrical problem. You will want to check out everything those codes are telling you. A bad speed sensor will absolutely cause the transmission to have a incorrectly calculated gear ratio, since it uses the speed sensor input to do the calculation. (Your transmission most likely has an input, and an output speed sensor). A fluid pressure switch uses the hydraulic fluid to press on a switch and tell the computer what gear you are in. This could also cause problems. Finally, bad shift solenoids can also cause the problems you discuss as they are responsible for directing the fluid inside the valve body to shift the gears. Personally, I would start checking the shift solenoids, then speed sensor, then pressure switch. (look up tests you can do to verify the sensors / solenoids are good)
MattsMotorz I forgot to mention, my speedometer has been fluctuating erratically. Can that info narrow my search a little further? Is the input speed sensor what the speedometer uses to gauge speed? I'm not finding a lot of detailed info regarding transmissions. Do you have any suggestions for where I can find detailed transmission circuit diagrams and testing methods?
The speedometer uses the output speed sensor to display the vehicle speed on the dashboard. All the information you want is in the factory service manual of the vehicle. Go to alldatadiy.com, they have all of this information (and more) for any vehicle. (I think its like 25 bucks for a year subscription). Typically, solenoid checks involve simply measuring the resistance and comparing it to spec. (This isn't always 100% though, since the solenoid could be physically compromised, causing it to get stuck when actuated.) Sometimes speed sensor have resistance checks. The best way to test them is to hook up a scan tool that can read live data and view their outputs this way.
I have a 92 GMC Safari. I replaced the 700R4 transmission with a used one from a salvage yard. It went bad 2 days after the warranty expired. I am trying to find someone to rebuild my old one on the budget of disability(SSD). Do I HAVE to replace the torque converter when I get this done?
This is a tricky question. The best course of action would obviously be to replace the torque converter. However, I have gotten away with reusing the old torque converter after rebuilding a transmission with no problems. If the failure was not caused by the torque converter, you will probably be fine by not replacing it. HOWEVER!!!! Those 700R4 / 4L60E transmissions had an issue with the torque converter clutch valve in the valve body causing the torque converter clutch to not be applied fully, causing it to slip and become destroyed and sending bits of torque converter clutch material through the transmission causing it to fail. This was a common problem, so if this is the case, then absolutely replace the torque converter. If you do this, MAKE SURE you get the CORRECT torque converter for the CORRECT YEAR!! Certain years of that transmission use a PWM (pulse width modulation) torque converter clutch that continuously applies and un-applies the clutch very fast. If the wrong converter is used, this will DESTROY the TCC in no time flat, causing transmission failure. Hope this helps!
MattsMotorz What are the compatible years for a 92? Is there a difference between a 4L60 and a 4L60E? Are there any numbers to identify a transmission?
The 4L60 is the non-electronically controlled version, E indicates "electronically controlled." I BELIEVE 91-94 are compatible, but I don't remember. There ARE identification codes, but they are in different places for different years. The 4L60E is an extremely popular transmission rebuild. Do some looking on google, there are tons of websites out there dedicated to the 4L60E.
Yes that is one possible reason (although usually it is not so much the servo that goes bad but the seals in the servo). Another possible reason is sticking valves in the valvebody. If a shift valve is sticking, it will cause the shift to occur later than intended, slamming it into gear.
There are lots of things that can cause that. Recently i've been looking for e65, it has ZF 6HP26 gearbox and oh boy, you can spend ALOT of time finding out what causes kicks.
A vacuum modulator is a mechanical way to determine the load on an engine so the transmission knows which gear to shift into. As load increases, engine vacuum decreases, this vacuum is connected to a diaphragm that will move in an out as vacuum changes. This diaphragm is linked to a valve in the valvebody that will downshift the transmission if a large enough load is present. Another way to do this exact thing is with a throttle valve (explained in the video). Now a days, load is determined by the computer and there is no longer any need for a throttle valve linkage or a vacuum modulator.
bsquared938 They work in a very similar way in that they have a valvebody and such, however they use a metal belt around two pulleys that can change in diameter rather than clutches and drums (although they may still have these things). The changing of diameter lets the transmission have an infinite amount of gear ratios.
The best transmission video out there. Better than animation. First time seeing automatic transmission parts.
Thanks!
I just learned more in eleven minutes about an automatic transmission than I have learned in all of the previous years combined! Thanks for tying up loose ends of knowledge I have about this subject and making it one complete thought process.
No problem! I am glad to hear that! Thanks for watching :]
Thank you for a very simple explanation of how a transmission works. I've spent 25 years working with engines at GM and have just transferred to a transmission group. A whole new animal and I was lost. Thanks again.
wow you really have to appreciate the thought and engineering that went into making these systems. Still amazes me.
One of the best explanations I've seen on AT's aimed at average viewers. Well done.
+SharpEnuff Thanks!
This is the best conceptual overview of an automatic transmission I've found. Thanks for posting.
Intrusive Obtrusion Thanks!
You did an amazing job describing the inner workings of an automatic transmission. I know alot of people wont even touch em. From rebuilding tranmissions auto / manual myself, you were rate on the money 100%. Great video keep up the good work.
Thanks! :D Glad you enjoyed the video!
you have the best video explaining the automatic transmission by far. now i understand what those passage are for. the fluid passages. excellent!!!
Your explanation of how an automatic transmission works was amazing. I have a greater appreciation for how my car works, and for my mechanic! Very well explained. Thank you for taking the time to teach us.
well this is much more complicated than I expected
thanks for explaining beyond the gear ratio aspect of automatic transmission and going into what actually makes it automatic
Thats the challenge! Planning to restore my transmissions...
Matticus. This is the best video I have ever seen on how an automatic transmission works. I really appreciate your work on this. Explaining the steels and the clutch plates, and an explanation of valves and check balls was essential in tying what I already know about transmissions into a coherent thought process. :D Thanks
No problem man! Thanks!
the explanation is short and good for anyone to understand thanks. looking forward to seeing your next video which is connected with this.
Thank you Matt. I was having a hard time studying for my ASE transmission test, the info in the study guides would not stick in my head due to the boring presentation in the guide, but this helped put the words from the pages into something I could relate to better.
Glad I could help! Good luck!
Wow, thank you for making this video, I watched many other videos to try and understand but none of them explained it as well or a simply as you, thank you so much. I genuinely appreciate that you took time out of your life to make this video. Thank you and God bless.
Glad the video helped in your understanding!
Good video man. Didn't realize automatics had multiplate clutches (like a motorcycle). Crazy world.
+F!@#Guilt Thanks for watching!
Matt
Wanted to stop by and say what a great overview you demonstrated here.
Nice Job! Thumbing up
Thanks a lot! I appreciate that!
despite the editing errors you mentioned, i've come away with a better understanding of how autos work than even the most complex animation videos. Kudos.
Glad to hear it! Sorry about the editing snaffoos!
Lol no worries, those quotes at the bottom were awesome.
Very simple way to explain but efective, thx man
I've always heard of how automatic transmissions use hydraulic pressure, but seeing the tubing is mind-boggling. I work in software yet the idea of a liquid-based circuit seems almost alien. Thanks for this informative video!
No prob! Glad you liked it!
Me too, same feeling. I worked in circuit design both digital and analog, and i can understand how it works, but it's amazing to actually see it.
I believe that this model is 125C GM transaxle.
Good job brother, I like this video.
Thank you
I started to look for some good explanation on AT woking principle after my KIA Canival AT broke down . . just fixed in a reconditioned AT unit . . I just want to say . . ' You explanation is the best . . '
Thanks a lot!
Awesome vid brosef! You just conveyed that better than my auto-mechanical engineering professor could ever dream of!!!!
Thanks a lot!
Excellent video!
i knew automatic transmissions where complicated but not this much... great video!
best video yet for a complete tranny operation video. easily understood by backyard mechanics. thanks!
THANK YOU SO MUCH! This is the only video that my dumb self could understand lol. I understood the planetary gears but I didn't know how the transmission held each in place. Great video man.
Chevymalibuls Thanks for watching!
Thanks a lot for this! I've been looking at a diagram and thinking about it most of today, but I didn't really understand it until now.
good day I live down in the Bahamas and really learning a lot from your videos. I'm working on a 2004 jag X-type (JF506E). I chance the fluid in it to Max-life and now it's not taking reverse. no I didn't take out the band anchor bolt. just chance the fluid. after getting no reverse I opened it to find the band broken. I chanced it out and still no reverse. at idle I'm getting 95psi at the Reverse Clutch Pressure Tap. I never adjusted the SERVO PISTON. thank you so much for your help
Thank you for explaining auto gearboxes to me so clearly !!!
A great video :)
Thanks for the video. Really helped.
Pfew, never knew an automatic transmission was this complicated. You have to got an academic degree to undertand it. Thank you for the clear explanation.
You don't need a degree to learn anything. If you're interested in learning about something then you can learn it! Glad you enjoyed the video.
MattsMotorz well said
It's the first time i really understand how it works ! u're just AWSOME
+Ahmed Hassan Thanks!
+Ahmed Hassan Same here! Thanks really much for the video!
Thank U so very much Matts, we appreciate your time & effort, thanks for showing the real thing, & very well explained in theory as well.
You reminded me of small Anakin (Jedi). Cheers & enjoy the good work :-)
Thanks, good simple explanation of a very complex device.
Thank you for posting this very informative video. Good job.
Man You re Awesome
Hey thanks! :D
Really Good And Consice Explanation
Thanks For Sharing
Cheers
Steve
Brilliant video... Thanks
I need some expert advice,
My 1991 vw selects gears after 3800rpm, could the throttle cable be causing the problem.? Or would the cause be something more serious?
It is very difficult to say. The best bet would be to hook a pressure gauge up to it to measure line pressure. I made a video on how to do this. However you will need to have the specs on hand from the factory service manual to see what the pressures should be.
Where can i purchase a factory service manual ? Great tutorial you explain everything in detail.
Ezequiel Quiroz First, try to find a PDF version of it for free on the internet. Many times you will be able to do this. If that doesn't work, try ebay. Finally, if you're really not having luck, go to the dealer.
Matt this is a great video. Thank you. Can you explain the difference between a locking and a not locking torque converter?
Sage Radachowsky Glad you enjoyed the video!
Most modern torque converters are locking. What this means is, when your car reaches a certain speed, there is a clutch inside the torque converter that engages and mechanically locks the impeller and the pump together. This means that the engine is also mechanically locked to the transmission instead of through a fluid coupling.
This is done because there are losses in transferring power through fluid, so to be more efficient, the fluid clutch is eliminated when it is not needed.
These things are so incredibly complex that it makes it difficult to explain how it works in a way that is easy to understand. There's just so much going on, it's a wonder that they are as reliable as they are.
+actionjksn You got that right!
That was really good! Thanks for sharing.
Your explanations of the automatic gearbox are excellent. However, I am now trying to find out how the AGS (Automatic Gear Shift) type of gearbox functions. I have just ordered a Suzuki Celerio SZ4, 988cc, 3 cylinder, petrol, with AGS (Automatic Gear Shift). Apparently, this car has a standard manual 5 speed gearbox, which has an electroncally controlled cluch (no cluch pedal). I took one for a test drive justerday and it has a auto type selector (D, N, R) but the lever can be pushed to the left and then, by pushing the lever forward, then release, then forward again and so on it goes up through the five gears. Similarly, to shift down the gears, pull (tap) the lever backwards each time another lowe gear is required. I was quite impressed but the sales team could not tell me how it actually works. Other than that, I can find no further information. I would be very greatful if you could point me in the right direction to find detailed information about this type of transmission operation.
Thank you in anticipation,
Alan Parsons (alanpars@gmail.com).
Thank you very much. You explained perfectly!!!
How to the clutches engage? You mentioned a piston, but when I think of piston, I think of something like a slug in a cylinder. To apply even pressure around the clutch pack, the piston would need to be shaped like a ring?
Great presentation. Thank you
Complex system but very well explained!
thanks man that is the most clean explnation i had on you tube , and i looking for to know what is happen when the the gear in N , or P
in neutral or Park, none of the hydraulic circuits that engages any of the clutches or bands are engaged.
Excellent video.
great video, always wondered how it worked
Thanks!
great job excellent concise explanation
Hey thanks!
Excellent video!!!
Thanks a lot!
lol im cracking up "clucth discs" great video though
Thanks for a great video.
No prob! Thanks for watching!
Can u offer any other suggestions or ideas to create a new automatic transmission that works completely different ?
hey hiram, I loved the video! thanks for such detailed explanation! I am having a problem with my 1-2 shift on my hydramatic 125. the car stopped doing a 1-2 shift suddenly.. what can this mean?
akshay ramachandran I'm not hiram! Lol
That problem can be caused by many things. You would need to take some pressure readings to get an idea of what is happening inside the transmission.
great video, thanks
Very informative! But is it normal that my car makes a single click noise when I put it in reverse and back to Drive? Just bought a year old car and I wanna make sure it is normal lol.
Thanks for the video... makes me want to get a manual transmission though :P
bleuflamenco Have Fun With All That Shifting And Beating The Thing And Getting That Right Hand/Arm And Left Leg/Foot Workout And All That Labor! I Love My Geo Metro Automatic Just The Same. I Don't Care If I Sacrifice 10 Or So MPG, Shifting Gets Old After So Long, lol.
in Europe, 90 year old Grandmas drive manual.
Thanks I learned more things.
Thanks for the video! You left your annotations on too long, though. You need to choose the endpoints or they cover up other text.
wow. The mechanics. Amazing, How did you get to know all this ?
Just studying. I read a few books on them. The best one being the book in the series 'Today's Technician"
hi excellent video. I have a 125c transmission equal to your video as I can get the technical manual that shows there I would like to get it, I'm from Mexico. can you give me information I thank you greetings
Hello gentleman, seems you are pretty expert in automatic transmission, so i would ask you something about my w5a580.
Well a 2007 Dodge nitro purchased as brand new car on 2008, he is pretty good any problem till today. Just He has always made a tweeting noise since from 2007, during cold season only never during summer.
Noise happen when releasing throttle and car is running due its inertia or when no throttle descending from hill.
As example if i'm driving at 60 mph, and fully release throttle, this noise appear with car continue to run, if i press again on throttle noise disappear.
Also it happen in 3rd 4th and 5th gear only never with 1st and 2nd engaged. Same way if car is running with that noise and i put in neutral noise disappear.
No happen during stop.
I'm nut sure that is transmission, any idea?
Thanks chris
Awesome explanation. I used to think there is no clutch disk inside automatic transmission and looks like I was wrong. So do I need to change out the clutch disks after a certain period of driving due to wear, like what we do with manual transmission?
No you don't. The clutch disks are not a regularly serviceable item and require the complete disassembly of the transmission to replace. However that doesn't mean that they won't wear out. When they start wearing out, the transmission starts slipping and a transmission overhaul (or rebuild) is required to correct the issue. All rebuild kits come with new clutches and steels.
MattsMotorz Cool. Looks like it takes a pretty long time (>10 years?) to get to that stage isn't it? And how do we know if the clutch starts to slip?
Not really! I've only been working on cars for a little over 3 years. But I have literally been OBSESSED with cars in that time. I have read many text books on transmission operation and engineering and also automotive engineering. But at the end of the day, the name of the game is experience. Which I have gotten a lot of in this short amount of time.
It is hard to describe what it feels like when clutches start to slip. But you will know something is wrong trust me!
MattsMotorz I was obsessed with cars when I was in high school but I wasn't into it that deep like you, and I do realize that car = $$$ unless one works on cars for living.
About how long does it take until the clutch in auto transmission worn out?
It varies greatly depending on which transmission it is. Under normal operating conditions, I have seen transmissions last over 200,000 miles with no problems. However, the most common cause for clutch failure is overheating. So if you take care of it, then it will last awhile!
Good work air
This is a great video. I have a Jeep Wrangler, 97, with 38RH transmission that was just rebuilt. I drive it for a while and it works fine but later when I come to a full stop it starts back out in second, not first. If I put it in park or down to low I get first, but not when I stop my speed to zero. So the shop said it was a governor issue and kindly replaced it. Just got it back today and it worked great. Second time I went out within twenty minutes its doing same thing again. How many times can I keep taking it back? Is there something wrong they might have done wrong in the rebuild or is this just a governor issue? They did a full rebuild, one of the gear sets was broken. I wish your shop was near me, I'd bring it in, but any help is much appreciated. Thanks
archivestereo Unfortunately, automatic transmission problems are a very complex subject. There could be a number of reasons why this is happening, but without being able to diagnose it myself, there isn't any useful information I can give you over the internet. :\
However, I can advise you to continue to take it back until it works! They are responsible for making sure the repair was done correctly.
MattsMotorz Thanks! I will do that!
Hi good evening every body , Your explanation of automatic transmission are good one / excellent. I am trying to find out how the AGS type of gear box function i want to know why automatic gear box not proved in diesel vehicle (Special for MARUTI SUZUKI) ,and what is reason for behind it . Already proved in petrol vehicle .......Ple reply...........
+somashekhar hirekurabar I don't know what you mean by "proved."
Thanks for the great video. What make model did this transmission come from? I have a 94 Chevy g20 van. Since I bought it (3 years ago, 46k) till now (71k miles) it has NEVER shifted into first gear. It drives pretty well though, no slippage in the other gears, and I can pretty much start on even the steepest hills in 2nd. The fluid is pretty dirty, and has kind of a burnt smell, but other then that its kind of amazing to me that it has gone 25k miles easily and drives great. From my understanding in this video it sounds like one potential cause of this problem is a bad shift valve?
+Lower 9th Wardermelon This came out of a 98 Chevy Cavalier.
It greatly depends on the transmission. I am not familiar with the transmission in a 94 Chevy G20 Van. While all automatics generally work the same way (except the CVT's), they still vary greatly on how they do it. The list of possible causes is too great for a comment on youtube without some sort of diagnostics such as line pressure tests.
Thank you very much for this video.I appreciate for your sharing knowledge.Sir.Please let me know the book`s name that you explain the valve body diagram.
Saw Tun Thanks for watching! The book I am using is the factory service manual for that particular transmission. Every factory service manual has these diagrams. But if you want to read more about how an automatic transmission works as well as how these diagrams work, get the book "Automatic Transmissions and Transaxles" by "Jack Erjavec." It is part of the "Todays Technicians" Series. It's very good!
Thank you so much.Sir. I`m trying to understanding automatic transmission work and valve body and sensor..Now I`m learning to rebuild auto transmission but I don`t understand how auto transmission change the power and how valve body control the fluid pressure and which sensor , which solonoid they use.Can you give me any advice to do better?
Definitely go buy that book. It will give you all the knowledge you want to know. It is too detailed to explain it in a UA-cam comment.
Thank you so much. Sir.God bless you.
+Saw Tun . I`ve already bought the books that you recommended . Can you help me to get the right answers of multiple choice ,ASE review questions and ASE challenge questions.. I had bought 4th edition shop manual ,5th edition shop manual and 3rd edition classroom manual.
Great Video! I have a question for you! I have a 88 cherokee with an AW4 transmission. The mechanic said is a very good transmission and that is also used in a lot of toyota cars. Is that true? I wanted to overhaul it because I think is a very reliable car.. Never done anything to the trasmission until now with 146,000 miles on it. Greetings from Costa Rica and thanks for your comments.
Hello! I cannot verify what he says, I never worked on that transmission. If the transmission is still good, I would advise to not overhaul it, as there is no reason to at this point.
@ 3:00 Because of that planetary gear system, would this one be a 3 speed?
This transmission is indeed a 3 speed but not just because of that one planet assembly. This unit actually has three planetary gear sets (if you count the one on the differential). They chain them together to obtain different gear ratios.
Great Vid...interesting and Correct!
simple n clear explanations. i have some ??
at stop or totally stationary.
1.) will the planetary gear rotate as i step on the brakes.
2.) the contact area, where the clutch bend clamp down is it rotating at stationary with the brakes apply?
correct me if i am wrong.
if the the area where the clutch bend claims down is always rotating.
means it vry hi wear to the clutch bend. am i correct?
hope u can help me out.
thx matt.
When you are stepping on the brakes and the car is stationary, nothing inside the transmission is moving (in terms of gear sets and drums and the like) except the torque converter. The fluid in the torque converter will be trying to spin the input shaft of the transmission, but since you are stopping the wheels from moving, the fluid will simply keep spinning around. This allows the engine to turn at a standstill without stalling the engine.
thx for your help.
another question. what does anti slip additives do & does it really work?
I am highly opposed to any kind of aftermarket additive which make claims to offer very cheap repair solutions to complex problems. There are a number of transmission anti-slip products out there which claim to repair slipping transmissions. I haven't ever used them, but from what I hear and from what I know about these kinds of products, I would say they don't work. In many cases, these kinds of products can do much more harm than good, such as stop-leak.
thx bro. i stick with amsoil.
MattsMotorz I had a ford escape (cd4e transmission) that would slip every time it came out of overdrive. I did a transmission fluid change and added in some Lucas oil stop slip. It didn't slip anymore after that. But that's just my experience
i love your job !!!! thank so much !!! and where can i buy your book ?? help me ?
+Nguyen Minh Thanks! The book I was using is the factory service manual for the particular transmission in the video. Every transmission has one.
If you want a good book on automatic transmissions, look up "Today's Technician Automatic Transmissions and Transaxles."
The other day I came to a stop quickly. The car didn't fall back into 1st gear. It fell out of gear. When I placed my foot on the gas the car snapped into first and the car lurched forward. Sooooo, does that mean the band or clutch discs stayed compressed or that pressure stayed in the port to first?
To me it says there was loss of pressure in the circuit that controls downshifting to first gear and the clutches / whatever is used were not able to keep the transmission in gear. When you stepped on the gas, that caused the pump to spin faster, increasing the pressure and allowing the transmission to clamp into gear. First thing that comes to mind is the transmission is low on fluid. Check that first.
Thanks, I'll check that. Appreciate your sharing of knowledge.
Thanks Matt...
I guess (still learning this stuff), an auto transmission is a function of speead and acceleration, whereas a manual transmission is a function of observing the rpm and INTENT to accelerate. An auto transmission only switches gears up at that point where rpm redlines, I suspect. For how else would you program that "infernal thing"? : My guess, it is designed around a car travelling, accelerating, decellerating, on a straight line track, or did engineers take into account turns and slopes too?
This is a good question. The way they do it is to take into account what the driver wants to do. But how do they know what the driver wants to do? Simple, measure the throttle plate position.
For example, if you are going up a slight hill, and keep the pedal still, your RPM's will go down. However many times this decrease in RPM isn't enough for the transmission to warrant a downshift. It will only downshift when the driver wants more power, namely, when the driver steps down on the pedal more. So the computer is constantly shifting based on many economic and efficiency factors, while also taking into account the wishes of the driver (based on pedal position). As for sharp turns and such, typically the car slows down to negotiate the turn, so this decrease in speed and load, as well as pedal position causes the computer to downshift. It all makes sense if you think about it enough. Hope I explained it half way decent and understood your question. It is very clever.
This is the reason why I do not like automatics as much as manuals. An automatic wont downshift until you have stepped on the pedal and the computer realizes "oh hey, he wants to accelerate! Better down shift!" Where as in a manual, one can downshift immediately with no wait. After driving a manual for years, an automatic feels slow and "mushy" when it delivers power.
Thank you!
Thanks man very great video
THANKS MATTS MOTORS,,,
i have a question, i would be very grateful if you could give me some advise. I have an automatic '96 Chevrolet Blazer and when i shift gear from Park to Reverse it sometimes emits a noise like if something gets hit, this also happens from Neutral to Drive. But this noise never happens while the car is moving, all the shifts come smoothly.
Does it "slam" into gear? Meaning, does the whole car "clunk" when you shift into drive or Reverse? Is it more noticeable when cold? Does it do it when the car is at operating temperature?
MattsMotorz yes it does slam into gear, it's like if the car wants to move a bit from the force but my foot is on the brakes. And it doesn't appears to be a difference doing it in cold or operating temp.
Is that vehicle front wheel drive with a transverse engine? If it is, many times this is caused by a stretched or worn drive chain inside the transmission. If it isn't then usually this kind of thing happens when transmissions get older. It could be many many things, little of which could be fixed unless the transmission is rebuilt. Making sure the CORRECT fluid is in it and at the proper level would be a good start.
Also, if you're on a hill it will be more apt to happen as well as there is a bigger load on the transmission.
MattsMotorz it has a RWD and a longitudinal engine, the fluid and level are correct, but the trans is quite old =/ ... tomorrow i will get it checked to see what's the real reason. Thanks for your help :)
What transmission where you using in this video?
+Dylan Stubenrauch 3T40 out of a 98 Chevy Cavalier
thank you again...
If the car doesn’t move forward it turn off but move on reverse what is the problem.?
My car (1995 Honda Civic Automatic) has a problem for which I'd like to narrow down the exact cause inside the transmission: The car, while standing and holding down the brake pedal in D, suddenly loses Revs and wants to make a move (switching to first gear?). I have to step off the brakes and push them again in order to prevent the engine from going off. This happens quite often now standing in a queue of cars (stop and go). What is exactly going on inside the transmission? Can this be due to wrong transmission fluid put in 2 years ago (car has no climbing problems and changes gears fluently while moving). Thx in advance for replies.
I am not sure what exactly you mean by "wants to make a move." But to me, this sounds like an engine problem, not transmission. Many times when the engine bogs down during idle it is caused by a vaccum leak such as a stuck open idle air control valve.
MattsMotorz Hey, many thx for the reply. The car came back from a friend (car mechanic). He only found the car doesn't accelerate well and suggests to change the transmission. Actually this car never really performed outstandingly well. Matts, I'm just a beginner with cars but could you please (if not to busy) find out if my Honda (1996 saloon, not 1995, CIVIC 1493cc, 4 Cylinders) has a partially electronically controlled transmission? The speedmeter doesn't work from time to time and I was driving the car usually even with the Error light on, because I found no trouble doing so. Now I read that a faulty speed sensor can cause symptoms that let even specialists believe that the transmission must be replaced. When the speedometer needle works I experience normal operation as far as I remember. So, simple question: Is my transmission depending on optimal feedback of the speedsensor? Thx for the help, man!
For a 1996 Honda civic, the transmission IS electronically controlled. I know this because I rebuilt one (I have a video series on it, the name of the transmission found in many civics that year is A4RA). A bad speedometer, input or output speed sensor can cause the transmission to not work properly, but as I said before, what you described to me sounds like an engine problem. Try checking the idle air control valve. I made a video showing how to do this. Also check for vacuum leaks. Also, what does your mechanic friend mean by "does not accelerate well." Is the transmission shifting too late? Is it slipping? That seems like too vague of a description to justify replacing the trans. I would get a second opinion.
MattsMotorz Sorry for the late, late reply. I felt I should give you an update to how I finally got rid of the problem. After I unplugged the speed sensor the issue vanished. Engine runs smoothly while standing on brakes. It seems the sensor gave false data about my current speed. I didn't do anything on the engine, neither I let anyone service the car. Until now the issue never came back. So, why would I bother buying a new sensor(most probable a used one since a new one would not be worth it considering the age of the car)? The car runs perfectly without it!? Even Economic, Normal and Sport mode are operating. Can I damage s.th. not using the Speed Sensor?
Glad to hear your figured out the problem!! The best thing to do would be to get a new sensor. The speed sensor is pretty important in a lot of systems on the car. I would wager that your car is in "limp home" mode and is using pre-programmed characteristics instead of taking live data from the sensors. This is what can happen when sensor signals go missing. You can get a new speed sensor for about 60 bucks at rockauto.com I believe it would be worth it if the car is in good shape and will last awhile.
good stuff, thanks...
Hey matt, loved the video! Is there an easy way to tell the difference between a mechanical problem and an electrical problem with the transmission still in the car? My 2002 Dodge Neon will not shift out of first gear. It is an intermittent problem that can last for days at a time. I have a trouble code for: Incorrect gear ratio 1 and 2, speed sensor circuit malfunction, fluid pressure switch, and shift solenoid malfunction.
Based on what you tell me, it sounds like your problem is an electrical problem. You will want to check out everything those codes are telling you. A bad speed sensor will absolutely cause the transmission to have a incorrectly calculated gear ratio, since it uses the speed sensor input to do the calculation. (Your transmission most likely has an input, and an output speed sensor). A fluid pressure switch uses the hydraulic fluid to press on a switch and tell the computer what gear you are in. This could also cause problems. Finally, bad shift solenoids can also cause the problems you discuss as they are responsible for directing the fluid inside the valve body to shift the gears. Personally, I would start checking the shift solenoids, then speed sensor, then pressure switch. (look up tests you can do to verify the sensors / solenoids are good)
Thank you. I already changed the filter and replaced the output speed sensor, hoping to get away with a cheap, easy repair.
MattsMotorz I forgot to mention, my speedometer has been fluctuating erratically. Can that info narrow my search a little further? Is the input speed sensor what the speedometer uses to gauge speed? I'm not finding a lot of detailed info regarding transmissions. Do you have any suggestions for where I can find detailed transmission circuit diagrams and testing methods?
The speedometer uses the output speed sensor to display the vehicle speed on the dashboard. All the information you want is in the factory service manual of the vehicle. Go to alldatadiy.com, they have all of this information (and more) for any vehicle. (I think its like 25 bucks for a year subscription). Typically, solenoid checks involve simply measuring the resistance and comparing it to spec. (This isn't always 100% though, since the solenoid could be physically compromised, causing it to get stuck when actuated.) Sometimes speed sensor have resistance checks. The best way to test them is to hook up a scan tool that can read live data and view their outputs this way.
Also, I have seen a bad input speed sensor cause the problems you describe.
maaan....hehehe i love this..extreme engineering,,,wow amazing
the torque converter looks like a giant bagel, lol
Thanks for video am Algeria 🇩🇿 may car nissan tiida problem of transmission r vitasase good bay
I have a 92 GMC Safari. I replaced the 700R4 transmission with a used one from a salvage yard. It went bad 2 days after the warranty expired. I am trying to find someone to rebuild my old one on the budget of disability(SSD). Do I HAVE to replace the torque converter when I get this done?
This is a tricky question. The best course of action would obviously be to replace the torque converter. However, I have gotten away with reusing the old torque converter after rebuilding a transmission with no problems. If the failure was not caused by the torque converter, you will probably be fine by not replacing it. HOWEVER!!!! Those 700R4 / 4L60E transmissions had an issue with the torque converter clutch valve in the valve body causing the torque converter clutch to not be applied fully, causing it to slip and become destroyed and sending bits of torque converter clutch material through the transmission causing it to fail. This was a common problem, so if this is the case, then absolutely replace the torque converter. If you do this, MAKE SURE you get the CORRECT torque converter for the CORRECT YEAR!! Certain years of that transmission use a PWM (pulse width modulation) torque converter clutch that continuously applies and un-applies the clutch very fast. If the wrong converter is used, this will DESTROY the TCC in no time flat, causing transmission failure. Hope this helps!
MattsMotorz What are the compatible years for a 92? Is there a difference between a 4L60 and a 4L60E? Are there any numbers to identify a transmission?
The 4L60 is the non-electronically controlled version, E indicates "electronically controlled." I BELIEVE 91-94 are compatible, but I don't remember. There ARE identification codes, but they are in different places for different years. The 4L60E is an extremely popular transmission rebuild. Do some looking on google, there are tons of websites out there dedicated to the 4L60E.
MattsMotorz Th
Thanks a billion.
So when a transmission "kicks" between gears, the servo is going bad?
Yes that is one possible reason (although usually it is not so much the servo that goes bad but the seals in the servo). Another possible reason is sticking valves in the valvebody. If a shift valve is sticking, it will cause the shift to occur later than intended, slamming it into gear.
There are lots of things that can cause that. Recently i've been looking for e65, it has ZF 6HP26 gearbox and oh boy, you can spend ALOT of time finding out what causes kicks.
What is a vacuum modulator?
A vacuum modulator is a mechanical way to determine the load on an engine so the transmission knows which gear to shift into. As load increases, engine vacuum decreases, this vacuum is connected to a diaphragm that will move in an out as vacuum changes. This diaphragm is linked to a valve in the valvebody that will downshift the transmission if a large enough load is present. Another way to do this exact thing is with a throttle valve (explained in the video). Now a days, load is determined by the computer and there is no longer any need for a throttle valve linkage or a vacuum modulator.
What gearbox is that ?
Thanks
3T40 out of a 98 Chevy cavalier
So what about CVT's, Continuously variable transmissions?
bsquared938 They work in a very similar way in that they have a valvebody and such, however they use a metal belt around two pulleys that can change in diameter rather than clutches and drums (although they may still have these things). The changing of diameter lets the transmission have an infinite amount of gear ratios.
MattsMotorz Hmmm okay that makes sense. Thanks so much for the great video, and also for answering my question :)
No prob! There is much more to say about CVT's but too much to compress into one UA-cam comment!
much thanks
Now Do A Video On The Aisin MX -17 Automatic Transmission. Mine. (Chevrolet Sprint, Geo Metro, Suzuki Swift.)
Will it hurt the trans If shift in a automatic I have a 99 mercury cougar. If It wouldn't hurt I would like to
Do you mean shift gears while driving? As long as you're not shifting in to PARK or Reverse it will be perfectly fine!
Yes like start for stop in 1st gear then 2nd an so on until I shift into D an I don't down shift an repeat
I appreciate you getting back to me I couldn't get a straight answer