Thank you , thank you, thank you !!! I've tried in vain to understand the drivetrain ( Transfercase ->propeller shaft -> front diff ) by reading thousands of articles and looking videos. But with this 20 minutes video you have explained all very well. Especially the open cutted cases where you can see the concurrent or opposite rotating of the axles / shafts are very helpful.
you probably dont give a shit but does anyone know of a trick to log back into an Instagram account?? I was stupid forgot the login password. I would appreciate any tips you can give me.
@Kelvin Matias Thanks for your reply. I got to the site on google and Im waiting for the hacking stuff now. Looks like it's gonna take quite some time so I will reply here later when my account password hopefully is recovered.
truly helped me understand why, even after disconnecting the front drive shaft, it sounds like gears are trying to fight each other. Perhaps my spring is failing on that darn fork.
this is a great presentation, I really enjoy every sec of this vid. Even I'm not a native English speaker, I could easily understand what are you talking about. Keep it up sir!
Excellent informative video. Apart from convenience I don't understand why toyota went with this system over the old free wheeling hubs. If my understanding is correct, with the ADD disengaged (running in 2wd), you still have the internal spider gears turning as well as one axle/cv. With the earlier system, when you unlocked the free-wheeling hubs, you effectively unlocked the wheel from the axle so the only thing turning was the wheel and the wheel bearing; none of the axles or internal diff components rotated with the old system.
this is an excellent delivery. Its simply awesome. I am currently transferring my 2005 Toyota Tacoma from 2WD into 4WD. I already replaced my engine and transmission with 4WD transmission with the electric shift actuator. I am currently running cables to the motor to get it to engage into differnt modes, i have the selector switch here with me. the front axle has also been installed with its shifter actuator motor. Kindly assist me with how to connect the electrical wiring to get them properly setup.
Very nice explain sir.hopfully u would able to upload this type of many advance technology video.thn u ,and also congrage u for under stand me this type of system.
Very helpful as I’m trying to figure out why my 4wd is being noisy. The noise goes away as soon as it’s back in 2wd. Now I see what moves in 4wd and what doesn’t move in 2wd. I have a 2005 sequoia. So looks like the noise could be the transfer case chain, the front prop, or the ring gear of the front diff? I checked/changes fluids already.. If you happen to see this comment I’d love any additional insight!
i have Toyota Prado 95-series 1999 year 5VZ-FE. 330-350.000 km all gear work correct 1-2-3-4. After runing i push STOP and trnsmission kick one time. After i push acsellerator and transmission kick one more time...( Maybe problem white solenoids? What you think, my friend?
Thanks for the enlightening video. A question, does this arrangement mean that the left front wheel is always turning the diff gears when the car is moving, even when no power is transmitted to the front axle?
Shot in the dark here on an old but great informative video! have a Tundra that I replaced the detachable front shaft with a solid shaft for off-road strength. I know I’m giving up mileage but am I going to damage my transfer case by turning the front drive shaft at all times?
I think you have given me a clue, I will have to shift my high/low lever into the high position & see if the 4x4 kicks on. As a follow-up question, what is affected by moving the high/low lever on these older systems, does this lever affect parts in the transfer case or the diff or both? if you can give me a clue about ghetto functionality of this lever, then I will certainty get theism 4x4 system up and running again. thank you in advance.
So, you are saying it is bad to have the fork in the ADD engaged because then all the front is moving regardless of whether the transfer case is in 4wd or not? Also, isn't it better, for dependability purposes, to lock the fork in place and disconnect the vacuum line to it, to ensure dependable 4wd functionality? Also, how much does locking the fork in place, via a hose tie, actually affect the gas mileage?
Yes, It is bad for two reasons: 1. It causes all the parts in the front axle, front driveshaft, and transfer case to rotate even though they are not being used. This causes parts to wear out prematurely. 2. It decreases fuel economy about 3 mpg on the vehicles I have owned because of the additional load from all of the unnecessarily rotating parts.
I think this gave me all the info I needed but maybe you can explain. I recently had my controller go out and I'm stuck in 4wd. I used some wire to manually operate front actuator but haven't done the transfer case yet. Why is the front actuator necessary?
hello professor the good news is I have finally purchased a used ring & pinion set for my 1996 Landcruiser. it's a 8 inch reverse rotation with a 4.10 ratio, as you had suggested. you had given me the backlash & pinion preload numbers (thanks again.) however, I would greatly appreciate if you could also give me the side bearing preload number for this truck front differential. that is the final piece of this puzzle after which I can begin the assembly of the differential. thank you in advance.
That drive shaft is not badly assembled? We set the crossheads at 90 degrees, otherwise it generates vibrations, at least that happens in the rear drive shaft, greetings from Santa Fe, Argentina
Front differential actuator engages the front axle. So if you are in 4WD mode and front diff actuator not engaged for any reasons. You basically will have 3WD instead. With 2 rear tires AND the left front driver wheel spinning only???😅
So I'm trying to diagnose a noise coming from my front end 2019 GMC Canyon (dealer can't recreate). Best I can describe it is a rotational clunk/thudding. I can only hear it at lower speeds (up to about 35 mph). At first I thought maybe it was tires, so I rotated tires, no change in noise. I checked wheel bearings, they appear solid. I jacked up the truck and spun both front tires. When I spin the driver side, I hear a clicking noise, that matches the speed of the tire as I spin it. This at first appeared to be the noise I was looking for. The passenger side does not have the same noise. Now after watching your video, I understand now why the pass side doesn't have any noise, because it's not spinning the side gears in the diff. But I'm still concerned that I can hear the side gears spinning so loudly when I do the driver side. Is it common to hear the side gears spinning so loudly? I made a video on my channel and you can hear the difference between driver and passenger side. Any input you can provide would be great.
hi professor, Well, I finally opened my 1996 Landcruiser front axle & diff over the summer. You were right, my ring gear was crushed to pieces! I wonder how that can happen, it obviously took a blunt force. The real job now is to find the right size ring gear. Can you please tell me what is the correct diameter ring gear for my vehicle front axle. Thanks.
When cruising in 2wd, with the r/f axle isolated and the ring/pinion/front propeller shaft/chain in transfer case stationary, what provides lubrication in the front diff and transfer case? I always thought the ring gear in the diff provided splash lubrication, and the chain for the transfer case.
Great work! Cool to see the synchros and stuff in there. Hadn’t seen a cut away view like that in motion! So what’s different on ‘14 and up tundras I wonder?
What is the point of having selectable 4x4 but the front diff isn`t connected? Like in what scenario the Transfer Case is in 4x4 but the front diff is disconnected?
Selectable 4WD just replaces the mechanical shift linkage of the transfer case with an electric motor doing the same thing. That scenario should only occur during the transition into 4WD. The transfer case must always engage before the front axle/diff can connect.
What controls the actuation of the axle disconnect? When you put the vehicle into 4wd does it simultaneously actuate at both the transfer case and the axle disconnect as well? Do they both actuate when the vehicle is switched to 4wd?
Great video!! My 2003 4Runner has multi-mode 4WD system. When I switch from 2WD to 4H, the 4WD light and center diff lock light blink for a long long time before it become solid, and sometimes it won't become solid at all. During this blinking time, the drive train binds when turning. Could this be issue with the transfer case or the ADD system? Thanks for you time!!
+Heavenscape Hi, normally the blinking 4WD light indicates that the front automatic disconnecting differential (ADD) has not connected yet (not in 4WD). You indicate that the powertrain binds at times during this situation. That tells me that your front differential is connecting and it is really in 4WD, but the front ADD actuator's internal 4WD switch is not functioning correctly. It sounds like you need a new ADD actuator assembly. Best wishes.
I do have a question. So basically you are demonstrating is that (EVEN IF for any reasons) the differential actuator malfunctioned and is STILL engaged while in 2WD mode, you wouldn't risk damaging your axles and/or your differential gears correct?? Except most likely you'll probably suffer from having poorer gas mileage and that's it??????
thanks! I should have also asked what is the appropriate backlash measurement on a '96 Landcruiser with an open differential. if you can share this info with I would greatly appreciate it. is there a reliable public website that I can go to get other torque specs for a Landcruiser? thanks.
I was able to locate a ring gear & pinion set online with a 4.11 ratio. they have it with a description of a rear diff piece but looks like I should be able to use the front & rear ring & pinion sets interchangeably since they should be identical. my question is given that the front ring & pinion ratio should be 4.10 could I use a ring & pinion set with ratio of 4.11 without breaking any pieces?
What about a Full-Time Transfer Case? it works a little bit different, it have just 1 fork in the t-case, can you post a video explaining how's that? and explain how works CDL (center differential locker), and that VC (Viscous Coupler) thing that is fooling me with my lexus lx450, thanks
Thank you! The hose is a vent, not a vacuum hose. As the air inside the ADD actuator and front axle heats up, it also expands. The hose allows it to breathe out and in through a little foam filter up inside the engine compartment.
I'm curious, isn't it bad for an open diff to have the spider gear set always rotating, when the DDA is engaged? I'm surprised Toyota went with such a solution, and have not installed two shaft-disconnecting mechanisms.
+Max oobbxxx Hi, it is not bad to always have them rotating as long as the side gear backlash is correct and the fluid level is correct. Almost every manufacturer is using this type of system, not just Toyota. Thanks for watching!
+WeberAuto I guess, now I understand why ― with the DDA disconnecting the power, the spider gears essentially freewheel, with hardly a surface contact. In this case, even the side gears, which lack proper bearings, can last forever. My confusion stemmed from a seemingly common occurrence of destroyed diffs due to frequently getting stuck on ice or in the mud, and letting one wheel spin violently (or doing lots of "burnouts"). But in these cases the spider gear set is loaded with power from the engine. Am I one the right track here?
Max oobbxxx Hi, yes, that is correct, but also remember that under those circumstances excessing speed and centripetal force (on the oil) causes a severe lack of lubrication which leads to seized spiders to the spider pinion shaft and eventual breakage of parts.
Professor I have a follow-up question, I can't find an 8" ring gear with a 4.10 ratio to buy online.the closest is an 8" with 4.88 ratio. could I use this one for my front diff, if so what would be the difference in drivability/ performance? does the higher ratio mean that the ring gear has more teeth than the one with a lower ratio & will that mean greater torque?
The front and rear axle gear ratios must be identical or you will break something in the powertrain. Different gear ratios would try to make the front and rear tires rotate at different speeds while driving; they cannot rotate at different speeds, so something will break. Best wishes.
Hello professor, I forgot to ask if you could please share with me the torque spec for the side bearing caps of the front differential on my 1996 Landcruiser. I seem to be missing this fourth critical measurement for my diff rebuild. if you can share this measurement with me I would greatly appreciate it. thank you very much in advance.
Ok, so my 4WD Hi/LO both work. Took truck (2004 Tundra) to dirt road and engaged and disengaged with no issues. My problem is the blinking lights on the dash, non-stop. Is this something Toyota can reset to stop it from blinking? It's driving me crazy.
great job professor! I have a 1996 Toyota Land Cruiser with a full-time 4x4 systems. the previous owner remove the front prop shaft. I went to reconnect it but the flange on th front diff is spinning freely instead of being locked in place. is my problem in the diff or the Axle shafts? I appreciate your feedback.
+Rupert Gaznabbi Hi, if the front diff spins freely, it is not a problem, the ADD actuator has not engaged the right hand axle shaft. That is normal. When the actuator does engage, then it will not spin freely. Try putting the transfer case in 4WD. That should also cause the front diff to engage and stop spinning freely. Thanks for watching!
At 8:07 in the video you put power to the 4hi actuator that moves a rod inside the actuator... My 4hi actuator is malfunctioning and I'm preparing myself to remove, disassemble, and clean in hopes that will repair function of it. My only problem I'm not clear on is when you re assemble the actuator to the transfer case , is where exactly is that rod supposed to be on that gear inside actuator. Most on forums are saying for 2wd the rod should be pushed all the way forward towards the Transfer case but there have been a few discrepancies. Any help would be greatly appreciated thank you
thanks a mil! just one rookie question, right now I am getting 17 mpg on the highway with just the rear wheel drive on the truck. with full time 4x4 will I get lower mph but with faster acceleration?
Hi my sj410 give some abnormal noise above 80kph from front side in 2WD, local mechanic says some prb with front differential prb, can it be like this as front differential is not engaged in 2WD
The presenter did an excellent job, HOWEVER, I think he made a critical mistake, at the very end of this video, he said "to shift back into 2wd from 4wd, we need to first disconnect the mode shift fork in the transfer case and then disconnect the ADD (automatic disconnecting diff)", something like this, actually, I believe the sequence should be REVERSED for the same reason, we don't want the side gears in the front diff case to fight each other at ANY time.
so are you saying as soon you engage 4WD that actuator on front differential will automatically engage the front differential??? or there is another switch for the front electric actuator to engage 4WD after the transfer case is in 4WD...thanx for the help
Hi professor, I have a question about locking front differentials on a 4wd vehicle. If the differential is permanently locked, but the transfer case is in 2wd and the automatic disconnecting differential is disconnected, does the diff locker cause the entire front end to rotate as if the ADD were engaged and thus reduce fuel economy? I am curious about this as there is a relatively cheap front differential locker for my 2012 Xterra called the Lokka that is permanently locked but can give slightly like a Detroit locker. Thank you for the wonderful presentation.
Thank you. Yes, it does, but it would be very difficult (dangerous) to steer since the locked diff would not allow the front tires to rotate at different speeds while cornering. I do not know of a good solution for the front axle of that vehicle.
@@WeberAuto Hi professor, thank you for the reply. I've heard that the front diff locker can cause severe understeer and oversteer when in 4wd, as this would mean the ADD is connected and the front differential is locked. But since the ADD disconnects when the vehicle is in 2wd, would the only drawback in 2wd be reduced fuel economy, or do both front wheels remain locked together even with ADD is disconnected?
thanks for your response. I am now looking to purchase the specialized tools you used to set up the gears. I know I will need to get a dial indicator torque wrench for the pinion nut. however, if I buy an indicator to check the pinion depth can that indicator be set up to also check the backlash on the ring gear?
My 2014 tundra has this setup. when in neutral, and shifting from 4 low to 4 high, i intermittently get a long shift time or it will make a god awful grinding noise under the truck like grinding gears. any idea on what to diagnose first? i first noticed very long times when shifting in and out of 4wd a few months ago. I was able to duplicate 2wd to 4wd issue without grinding, just flashing 4wd light. i was under the truck and heard the motor on the transfer case move and the one on the front diff move just no confirmation/
hello professor, I was just shopping around for a good shim kit for the front diff of my `96 Landcruiser and an online vendor said that this diff does not carry side bearing shims, they use adjusters. is that really true? if so is that where I would need a spanner wrench? thanks.
Yes, the side bearing preload and backlash are set by threaded adjusters. A spanner wrench can be purchased at most home improvement stores, theyare used for plumbing. See my video towards the end for threaded adjuster usage 1963 Chevrolet Biscayne Positraction Differential Overhaul - Part 4 - Final Assembly
hello professor, I am going to disassemble my front differential to figure out why the yoke spins without engaging the front wheels. I have two questions, first, could u tell me what is the correct preload for the pinion gear when I reassemble it? second, do I need to remove the Birfield joints and connecting axle rods in order to remove ring gear from the differential? I have a ‘96 Landcruiser with a regular open differential. thanks.
Hi, Yes, 1. you need to remove the axle shafts in order to remove the ring gear from the housing. 2. The pinion bearing preload is 8.7 − 13.9 in*lbf. Best wishes!
+A “AAS” Saeefan Hi, every 30,000 miles with 1.3 L (1.4 qt., 1.1 lmp.qt.) Gear oil API GL-4 or GL-5 SAE 75W-90 oil. see drivers.lexus.com/lexusdrivers/info/my-lexus/resources/submit-owners-manual-search?section=om&keywords=fluid&searchType=&model=LX470&year=2001&x=0&y=0#
Awesome video, but you lost me when you started talking about the purpose of the DDA in the front differential/axle to prevent the right side wheel turning in the opposite direction of the left side wheel. Rear wheel drive cars don't have DDA in the rear axle and yet we still can push them while they're on the ground and both wheels will turn in the same direction; That's the purpose of the differential to be in there to make the car turn smoothly and reduce tires wear and tear. Please correct me if I'm wrong. And again thank you for the videos I really enjoy watching'em... Happy Easter :-)
Boy that motor mount on front axle is awfully low. I can see that getti9ng hit off roading. So I guess the front axle has no ability to have either limited slip of locking ability?
HI PROF JOHN, I DID NOT DO MACHANICAL ENGINEERING BUT I NOW DEVELOPED LOVE FOR IT. PLEASE HELP. I BOUGHT WORKSHOP MANUAL AND SOMEWHERE IS WRITTEN AS FOLLOW FITS AND TOLERANCES DESCRIPTION SIZE OF NEW PARTS AND WEAR (Mm) Diameter of driving gear shaft 48.961 ÷ 49.000 Then my question is : what is this divide sign for or mean? what i expected is 48.961 to 49.000 to show that the shaft should be between the two figures M.B.S MOSHITOA (S AFRICA)
hello professor, five months ago you had give me a pinion preload spec of 8.7 - 13.9 in -lb for the front differential of my `96 Landcruiser. is this spec for new or reused bearings? would you be so kind as to provide the spec for both the new & reused bearings. if the original bearings are not bad I can reuse them & save a bit since I am on a shoe string budget for this repair. also, could you please share the torque spec for the ten ring gear bolts for this differential. thank in advance.
Can someone provide me with some guidance on what the problem is with my 4runner 4wd? When I shift in 4wd it engages very smooth but when it disengages it hesitates for about 10 secs and disengages with a loud bang (feels like something hitting the car). I have replaced all the oil already and have no idea about previous 4wd usage. Thank for any feedback you can provide on this problem.
@@WeberAuto You are the first one to provided any meaning response. Which connections would you look at first? should I start with the 4WD switch, and Vspeed SW? How would I check the wear? I just changed the Tranf case oil, and the Dif all were dark but not burnt and no metal shaving just mud metal on magnetic and transfer case was half quart low.
@@Asian_Connection The electrical connector ar the front axle disconnect motor/actuator. Check for corrosion and damage. If good, follow the wire from the connector back to power, ground, etc. MAke sure that are good, clean, and tight.
thanks for your prompt response. however, looking at the transfer case & front diff of my `96 land cruiser I don't see an ADD switch, as you mentioned. this is a full-time 4x4 systems so perhaps there is no such switch to disconnect & reconnect the 4x4 systems. the real question is how do you disconnect & reconnect the 4x4 systems on an older transfer case & diff. could moving the high/low lever next to the gear selector do the trick? does this lever have a neutral position? I look forward to your response. thanks.
+Rupert Gaznabbi You are correct, the full-time AWD system does not have a front ADD, so if your front pinion spins freely, you really have problems! On older systems, the transfer case lever must be in neutral to disconnect engine power from the differentials, or 2WD to disconnect only the front diff. I hope that helps.
18 dec 2023 5:8 am est ( utc - 5 ) : thanks . just-now i finish fast-forward-and-rewind-repeatedly-and-partially-seeing this movie , not fully-seeing this movie .
Hi , please I need some help , 2 month ago one guy rebuild the axle of my car driver side , after that the car start jumping only when I press the gas pedal , I already replace both axles but the problem still there but feel better than before but the problem still there , what cloud it be , please help.
Do you think the differential is bad already , when I took out the axle I saw has no grease only little do you thing this could damage the differential
Man this cutout view is so awesome, thanks for this so much
I think it's amazing how people come up with this stuff
Agreed! Thanks for watching
Thank you , thank you, thank you !!! I've tried in vain to understand the drivetrain ( Transfercase ->propeller shaft -> front diff ) by reading thousands of articles and looking videos. But with this 20 minutes video you have explained all very well. Especially the open cutted cases where you can see the concurrent or opposite rotating of the axles / shafts are very helpful.
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I was stupid forgot the login password. I would appreciate any tips you can give me.
@Dakota Oakley instablaster :)
@Kelvin Matias Thanks for your reply. I got to the site on google and Im waiting for the hacking stuff now.
Looks like it's gonna take quite some time so I will reply here later when my account password hopefully is recovered.
@Kelvin Matias it did the trick and I now got access to my account again. I'm so happy:D
Thanks so much you really help me out !
@Dakota Oakley Glad I could help =)
These are truly outstanding videos. You are an excellent teacher.
GulfVet213 Thank you!
Jeep chrokee kl 2014 to 2023 has two transfer cases each end on there more serious models. Love to see how it works . Great vid
i appreciated cars more knowing the details of how it works and made. thank you for showing us.
+Yohan Ksor Thank you!
truly helped me understand why, even after disconnecting the front drive shaft, it sounds like gears are trying to fight each other. Perhaps my spring is failing on that darn fork.
this is a great presentation, I really enjoy every sec of this vid. Even I'm not a native English speaker, I could easily understand what are you talking about. Keep it up sir!
+Rubby Rizky Thank you!
As a native speaker, with little car knowledge, this is also really great presentation.
Excellent informative video. Apart from convenience I don't understand why toyota went with this system over the old free wheeling hubs. If my understanding is correct, with the ADD disengaged (running in 2wd), you still have the internal spider gears turning as well as one axle/cv. With the earlier system, when you unlocked the free-wheeling hubs, you effectively unlocked the wheel from the axle so the only thing turning was the wheel and the wheel bearing; none of the axles or internal diff components rotated with the old system.
this is an excellent delivery. Its simply awesome. I am currently transferring my 2005 Toyota Tacoma from 2WD into 4WD. I already replaced my engine and transmission with 4WD transmission with the electric shift actuator. I am currently running cables to the motor to get it to engage into differnt modes, i have the selector switch here with me. the front axle has also been installed with its shifter actuator motor. Kindly assist me with how to connect the electrical wiring to get them properly setup.
It's crazy how modern part time. 4x4 don't use disengaging lock hub instead anymore...
excellent video and display model, thank you for keeping this video up for us newbies to learn.
Thank you!
Wow! Thank you! You are a scholar and a gentleman! Incredible videos!
Again another very informative video, Love watching Ur classes
Thank you!
Excellent demonstration, thank you so much
Glad you enjoyed it!
thanks again, you're the best! will give you Sid feedback after I put it in next summer.
Thank you!
Sir are u great explaind for everyone works u are best teacher thank
another excellent presentation.
Thank you!
I really enjoyed your video. Please keep up the good work.
James Watkins Thank you!
thank you very interesting
Thanks for watching
Very good explanation and video.
Excellent video... you explain all very nice 👍 !!!
Thank you
Very nice explain sir.hopfully u would able to upload this type of many advance technology video.thn u ,and also congrage u for under stand me this type of system.
I would love a diagram or video of how to wire the contacts for manual switch operation. as in retrofitting a 2wd to 4x4 conversion.
Very helpful as I’m trying to figure out why my 4wd is being noisy. The noise goes away as soon as it’s back in 2wd. Now I see what moves in 4wd and what doesn’t move in 2wd. I have a 2005 sequoia.
So looks like the noise could be the transfer case chain, the front prop, or the ring gear of the front diff?
I checked/changes fluids already..
If you happen to see this comment I’d love any additional insight!
Thank you very mutch from Russia!
Thank you!
you not have video old automatic transmission AISIN A02A/A343F ? (sorry my English ;)
Good idea
i have Toyota Prado 95-series 1999 year 5VZ-FE. 330-350.000 km
all gear work correct 1-2-3-4. After runing i push STOP and trnsmission kick one time. After i push acsellerator and transmission kick one more time...( Maybe problem white solenoids? What you think, my friend?
Thanks for the enlightening video. A question, does this arrangement mean that the left front wheel is always turning the diff gears when the car is moving, even when no power is transmitted to the front axle?
Shot in the dark here on an old but great informative video! have a Tundra that I replaced the detachable front shaft with a solid shaft for off-road strength. I know I’m giving up mileage but am I going to damage my transfer case by turning the front drive shaft at all times?
I think you have given me a clue, I will have to shift my high/low lever into the high position & see if the 4x4 kicks on. As a follow-up question, what is affected by moving the high/low lever on these older systems, does this lever affect parts in the transfer case or the diff or both? if you can give me a clue about ghetto functionality of this lever, then I will certainty get theism 4x4 system up and running again. thank you in advance.
+Rupert Gaznabbi The high-low lever only engaged or disengaged a planetary gear set in the transfer case to givbe you 4WD low.
So, you are saying it is bad to have the fork in the ADD engaged because then all the front is moving regardless of whether the transfer case is in 4wd or not? Also, isn't it better, for dependability purposes, to lock the fork in place and disconnect the vacuum line to it, to ensure dependable 4wd functionality?
Also, how much does locking the fork in place, via a hose tie, actually affect the gas mileage?
Yes, It is bad for two reasons: 1. It causes all the parts in the front axle, front driveshaft, and transfer case to rotate even though they are not being used. This causes parts to wear out prematurely. 2. It decreases fuel economy about 3 mpg on the vehicles I have owned because of the additional load from all of the unnecessarily rotating parts.
very informative, thank you...
I think this gave me all the info I needed but maybe you can explain. I recently had my controller go out and I'm stuck in 4wd. I used some wire to manually operate front actuator but haven't done the transfer case yet. Why is the front actuator necessary?
hello professor
the good news is I have finally purchased a used ring & pinion set for my 1996 Landcruiser. it's a 8 inch reverse rotation with a 4.10 ratio, as you had suggested. you had given me the backlash & pinion preload numbers (thanks again.) however, I would greatly appreciate if you could also give me the side bearing preload number for this truck front differential. that is the final piece of this puzzle after which I can begin the assembly of the differential. thank you in advance.
The side bearing preload is 6-8 inch pounds higher than the pinion bearing preload alone (as measured at the pinion nut). Best wishes!
That drive shaft is not badly assembled? We set the crossheads at 90 degrees, otherwise it generates vibrations, at least that happens in the rear drive shaft, greetings from Santa Fe, Argentina
Front differential actuator engages the front axle.
So if you are in 4WD mode and front diff actuator not engaged for any reasons. You basically will have 3WD instead. With 2 rear tires AND the left front driver wheel spinning only???😅
So I'm trying to diagnose a noise coming from my front end 2019 GMC Canyon (dealer can't recreate). Best I can describe it is a rotational clunk/thudding. I can only hear it at lower speeds (up to about 35 mph). At first I thought maybe it was tires, so I rotated tires, no change in noise. I checked wheel bearings, they appear solid. I jacked up the truck and spun both front tires. When I spin the driver side, I hear a clicking noise, that matches the speed of the tire as I spin it. This at first appeared to be the noise I was looking for. The passenger side does not have the same noise. Now after watching your video, I understand now why the pass side doesn't have any noise, because it's not spinning the side gears in the diff. But I'm still concerned that I can hear the side gears spinning so loudly when I do the driver side. Is it common to hear the side gears spinning so loudly? I made a video on my channel and you can hear the difference between driver and passenger side. Any input you can provide would be great.
hi professor,
Well, I finally opened my 1996 Landcruiser front axle & diff over the summer. You were right, my ring gear was crushed to pieces! I wonder how that can happen, it obviously took a blunt force. The real job now is to find the right size ring gear. Can you please tell me what is the correct diameter ring gear for my vehicle front axle. Thanks.
It had an 8" diameter ring gear with a 4.10 gear ratio. Driving on dry pavement with the diff lock engaged could do that too. Best wishes!
very informative...thanks
nxrgamer Thank you!
When cruising in 2wd, with the r/f axle isolated and the ring/pinion/front propeller shaft/chain in transfer case stationary, what provides lubrication in the front diff and transfer case? I always thought the ring gear in the diff provided splash lubrication, and the chain for the transfer case.
The side gears are still rotating and flinging oil as you drive
Great work! Cool to see the synchros and stuff in there. Hadn’t seen a cut away view like that in motion!
So what’s different on ‘14 and up tundras I wonder?
Thank you. They moved to a Magna Powertrain transfer case. Same a GM and RAM
@@WeberAuto really? Any functional differences? Build quality differences?
@@DirtE30 Functionally different ways to accomplish the same thing. They have held up well.
What is the point of having selectable 4x4 but the front diff isn`t connected? Like in what scenario the Transfer Case is in 4x4 but the front diff is disconnected?
Selectable 4WD just replaces the mechanical shift linkage of the transfer case with an electric motor doing the same thing. That scenario should only occur during the transition into 4WD. The transfer case must always engage before the front axle/diff can connect.
What controls the actuation of the axle disconnect? When you put the vehicle into 4wd does it simultaneously actuate at both the transfer case and the axle disconnect as well? Do they both actuate when the vehicle is switched to 4wd?
Great video!! My 2003 4Runner has multi-mode 4WD system. When I switch from 2WD to 4H, the 4WD light and center diff lock light blink for a long long time before it become solid, and sometimes it won't become solid at all. During this blinking time, the drive train binds when turning. Could this be issue with the transfer case or the ADD system? Thanks for you time!!
+Heavenscape Hi, normally the blinking 4WD light indicates that the front automatic disconnecting differential (ADD) has not connected yet (not in 4WD). You indicate that the powertrain binds at times during this situation. That tells me that your front differential is connecting and it is really in 4WD, but the front ADD actuator's internal 4WD switch is not functioning correctly. It sounds like you need a new ADD actuator assembly. Best wishes.
I do have a question. So basically you are demonstrating is that (EVEN IF for any reasons) the differential actuator malfunctioned and is STILL engaged while in 2WD mode, you wouldn't risk damaging your axles and/or your differential gears correct??
Except most likely you'll probably suffer from having poorer gas mileage and that's it??????
thanks! I should have also asked what is the appropriate backlash measurement on a '96 Landcruiser with an open differential. if you can share this info with I would greatly appreciate it. is there a reliable public website that I can go to get other torque specs for a Landcruiser? thanks.
Hi, backlash is .005"-.007". I do not know of any free public websites, but there are subscription ones. See www.nastf.org
I was able to locate a ring gear & pinion set online with a 4.11 ratio. they have it with a description of a rear diff piece but looks like I should be able to use the front & rear ring & pinion sets interchangeably since they should be identical. my question is given that the front ring & pinion ratio should be 4.10 could I use a ring & pinion set with ratio of 4.11 without breaking any pieces?
Yes, I think you will be fine.
Do you have a wiring Diagram for the shift forks? To make a manually controlled shift switch setup? Converting a 2wd Tundra to 4wd.
What about a Full-Time Transfer Case? it works a little bit different, it have just 1 fork in the t-case, can you post a video explaining how's that? and explain how works CDL (center differential locker), and that VC (Viscous Coupler) thing that is fooling me with my lexus lx450, thanks
Great informative video. What is the vacum hose going to the actuator for? Thank you
Thank you! The hose is a vent, not a vacuum hose. As the air inside the ADD actuator and front axle heats up, it also expands. The hose allows it to breathe out and in through a little foam filter up inside the engine compartment.
WeberAuto ....
I'm curious, isn't it bad for an open diff to have the spider gear set always rotating, when the DDA is engaged? I'm surprised Toyota went with such a solution, and have not installed two shaft-disconnecting mechanisms.
+Max oobbxxx Hi, it is not bad to always have them rotating as long as the side gear backlash is correct and the fluid level is correct. Almost every manufacturer is using this type of system, not just Toyota. Thanks for watching!
+WeberAuto I guess, now I understand why ― with the DDA disconnecting the power, the spider gears essentially freewheel, with hardly a surface contact. In this case, even the side gears, which lack proper bearings, can last forever.
My confusion stemmed from a seemingly common occurrence of destroyed diffs due to frequently getting stuck on ice or in the mud, and letting one wheel spin violently (or doing lots of "burnouts"). But in these cases the spider gear set is loaded with power from the engine. Am I one the right track here?
Max oobbxxx Hi, yes, that is correct, but also remember that under those circumstances excessing speed and centripetal force (on the oil) causes a severe lack of lubrication which leads to seized spiders to the spider pinion shaft and eventual breakage of parts.
Professor
I have a follow-up question, I can't find an 8" ring gear with a 4.10 ratio to buy online.the closest is an 8" with 4.88 ratio. could I use this one for my front diff, if so what would be the difference in drivability/ performance? does the higher ratio mean that the ring gear has more teeth than the one with a lower ratio & will that mean greater torque?
The front and rear axle gear ratios must be identical or you will break something in the powertrain. Different gear ratios would try to make the front and rear tires rotate at different speeds while driving; they cannot rotate at different speeds, so something will break. Best wishes.
Hello professor,
I forgot to ask if you could please share with me the torque spec for the side bearing caps of the front differential on my 1996 Landcruiser. I seem to be missing this fourth critical measurement for my diff rebuild. if you can share this measurement with me I would greatly appreciate it. thank you very much in advance.
58 ft-lbs Best wishes
does the driveshaft coming from the T Case ever disconnect from the transfercase chain? or are they always mated?
The chain and the drive gear disconnect from the T-case output shaft in 2WD. Thanks for watching
So what would happen if that ADD gets stuck on and the transfer case is disengaged?
Ok, so my 4WD Hi/LO both work. Took truck (2004 Tundra) to dirt road and engaged and disengaged with no issues. My problem is the blinking lights on the dash, non-stop. Is this something Toyota can reset to stop it from blinking? It's driving me crazy.
great job professor! I have a 1996 Toyota Land Cruiser with a full-time 4x4 systems. the previous owner remove the front prop shaft. I went to reconnect it but the flange on th front diff is spinning freely instead of being locked in place. is my problem in the diff or the Axle shafts? I appreciate your feedback.
+Rupert Gaznabbi Hi, if the front diff spins freely, it is not a problem, the ADD actuator has not engaged the right hand axle shaft. That is normal. When the actuator does engage, then it will not spin freely. Try putting the transfer case in 4WD. That should also cause the front diff to engage and stop spinning freely. Thanks for watching!
At 8:07 in the video you put power to the 4hi actuator that moves a rod inside the actuator... My 4hi actuator is malfunctioning and I'm preparing myself to remove, disassemble, and clean in hopes that will repair function of it. My only problem I'm not clear on is when you re assemble the actuator to the transfer case , is where exactly is that rod supposed to be on that gear inside actuator. Most on forums are saying for 2wd the rod should be pushed all the way forward towards the Transfer case but there have been a few discrepancies. Any help would be greatly appreciated thank you
thanks a mil! just one rookie question, right now I am getting 17 mpg on the highway with just the rear wheel drive on the truck. with full time 4x4 will I get lower mph but with faster acceleration?
You will get lower mpg and no change in acceleration unless you have a tire that has lost traction.
what is the different AWD between 4WD system?? please explain in video :)
Hi my sj410 give some abnormal noise above 80kph from front side in 2WD, local mechanic says some prb with front differential prb, can it be like this as front differential is not engaged in 2WD
Does the noise go away in 4WD? If so, the axle oil level may be low or the differential gears are probably worn
The presenter did an excellent job, HOWEVER, I think he made a critical mistake, at the very end of this video, he said "to shift back into 2wd from 4wd, we need to first disconnect the mode shift fork in the transfer case and then disconnect the ADD (automatic disconnecting diff)", something like this, actually, I believe the sequence should be REVERSED for the same reason, we don't want the side gears in the front diff case to fight each other at ANY time.
Hi proffesor! why is it so important to engage the transfer case before the differential when switching to 4WD? and when going back to 2WD?
If you do not engage the transfer case first, the front axle will never engage unless you are stopped. Best wishes
thanks!
so are you saying as soon you engage 4WD that actuator on front differential will automatically engage the front differential??? or there is another switch for the front electric actuator to engage 4WD after the transfer case is in 4WD...thanx for the help
Yes, transfer case first then front axle
thank you
I have the same transfer case. I am willing to donate it to you if you’re interested let me know. We can work on the shipping if you are interested.
Thank you, I have several of them already. Have a great day
Hi professor, I have a question about locking front differentials on a 4wd vehicle. If the differential is permanently locked, but the transfer case is in 2wd and the automatic disconnecting differential is disconnected, does the diff locker cause the entire front end to rotate as if the ADD were engaged and thus reduce fuel economy? I am curious about this as there is a relatively cheap front differential locker for my 2012 Xterra called the Lokka that is permanently locked but can give slightly like a Detroit locker. Thank you for the wonderful presentation.
Thank you. Yes, it does, but it would be very difficult (dangerous) to steer since the locked diff would not allow the front tires to rotate at different speeds while cornering. I do not know of a good solution for the front axle of that vehicle.
@@WeberAuto Hi professor, thank you for the reply. I've heard that the front diff locker can cause severe understeer and oversteer when in 4wd, as this would mean the ADD is connected and the front differential is locked. But since the ADD disconnects when the vehicle is in 2wd, would the only drawback in 2wd be reduced fuel economy, or do both front wheels remain locked together even with ADD is disconnected?
@@RagingAura True, if the ADD is disconnected, the only drawback would be the front driveshaft would always spin.
@@WeberAuto Thank you for the explanation, this helps a great deal.
thanks for your response. I am now looking to purchase the specialized tools you used to set up the gears. I know I will need to get a dial indicator torque wrench for the pinion nut. however, if I buy an indicator to check the pinion depth can that indicator be set up to also check the backlash on
the ring gear?
Yes, you can use the same dial indicator. Best wishes!
My 2014 tundra has this setup. when in neutral, and shifting from 4 low to 4 high, i intermittently get a long shift time or it will make a god awful grinding noise under the truck like grinding gears. any idea on what to diagnose first? i first noticed very long times when shifting in and out of 4wd a few months ago. I was able to duplicate 2wd to 4wd issue without grinding, just flashing 4wd light. i was under the truck and heard the motor on the transfer case move and the one on the front diff move just no confirmation/
what is that black tubing coming from the ADD motor actuator for / do. Is it a vacuum tube?
+Charlie Clifton Hi, no it is a vent tube to allow for air expansion when the actuator and axle warm up. Thanks for watching!
What does it mean when 4wd is activated but front wheels lock up?
hello professor,
I was just shopping around for a good shim kit for the front diff of my `96 Landcruiser and an online vendor said that this diff does not carry side bearing shims, they use adjusters. is that really true? if so is that where I would need a spanner wrench? thanks.
Yes, the side bearing preload and backlash are set by threaded adjusters. A spanner wrench can be purchased at most home improvement stores, theyare used for plumbing. See my video towards the end for threaded adjuster usage 1963 Chevrolet Biscayne Positraction Differential Overhaul - Part 4 - Final Assembly
hello professor,
I am going to disassemble my front differential to figure out why the yoke spins without engaging the front wheels. I have two questions, first, could u tell me what is the correct preload for the pinion gear when I reassemble it? second, do I need to remove the Birfield joints and connecting axle rods in order to remove ring gear from the differential? I have a ‘96 Landcruiser with a regular open differential. thanks.
Hi, Yes, 1. you need to remove the axle shafts in order to remove the ring gear from the housing. 2. The pinion bearing preload is 8.7 − 13.9 in*lbf. Best wishes!
it would be nice to see on how to replace a transmission for a 2005 gmc yukon xl 1500 , 5.3
+carlos salazar Thanks for your feedback!
Buy a Toyota.
those are easy. most likely got the 4l60e
Thank you, very informative. How often to change the transfer case oil. I have a lexus, LX 470 2001. what kind of oil to use.
thanks .
+A “AAS” Saeefan Hi, every 30,000 miles with 1.3 L (1.4 qt., 1.1 lmp.qt.) Gear oil API GL-4 or GL-5 SAE 75W-90 oil. see drivers.lexus.com/lexusdrivers/info/my-lexus/resources/submit-owners-manual-search?section=om&keywords=fluid&searchType=&model=LX470&year=2001&x=0&y=0#
gfh
Awesome video, but you lost me when you started talking about the purpose of the DDA in the front differential/axle to prevent the right side wheel turning in the opposite direction of the left side wheel.
Rear wheel drive cars don't have DDA in the rear axle and yet we still can push them while they're on the ground and both wheels will turn in the same direction; That's the purpose of the differential to be in there to make the car turn smoothly and reduce tires wear and tear.
Please correct me if I'm wrong. And again thank you for the videos I really enjoy watching'em... Happy Easter :-)
i have a 4 wd toyotaaxio 2007 model agrinding sound comes from rear -changed both rear bearing what else it can be
What is your prefer to subaru symethrıcal awd or jeep's awd ?
Boy that motor mount on front axle is awfully low. I can see that getti9ng hit off roading. So I guess the front axle has no ability to have either limited slip of locking ability?
Do the front differential gears spin when 4wd high is not activated while driving?
HI PROF JOHN, I DID NOT DO MACHANICAL ENGINEERING BUT I NOW DEVELOPED LOVE FOR IT. PLEASE HELP. I BOUGHT WORKSHOP MANUAL AND SOMEWHERE IS WRITTEN AS FOLLOW
FITS AND TOLERANCES
DESCRIPTION SIZE OF NEW PARTS AND WEAR (Mm)
Diameter of driving gear shaft 48.961 ÷ 49.000
Then my question is : what is this divide sign for or mean?
what i expected is 48.961 to 49.000 to show that the shaft should be between the two figures
M.B.S MOSHITOA (S AFRICA)
hello professor,
five months ago you had give me a pinion preload spec of 8.7 - 13.9 in -lb for the front differential of my `96 Landcruiser. is this spec for new or reused bearings? would you be so kind as to provide the spec for both the new & reused bearings. if the original bearings are not bad I can reuse them & save a bit since I am on a shoe string budget for this repair. also, could you please share the torque spec for the ten ring gear bolts for this differential. thank in advance.
Can someone provide me with some guidance on what the problem is with my 4runner 4wd? When I shift in 4wd it engages very smooth but when it disengages it hesitates for about 10 secs and disengages with a loud bang (feels like something hitting the car). I have replaced all the oil already and have no idea about previous 4wd usage. Thank for any feedback you can provide on this problem.
It sound like the front ADD actuator is moving too slowly. Check electrical connections and wear. Thanks for watching
@@WeberAuto You are the first one to provided any meaning response. Which connections would you look at first? should I start with the 4WD switch, and Vspeed SW? How would I check the wear? I just changed the Tranf case oil, and the Dif all were dark but not burnt and no metal shaving just mud metal on magnetic and transfer case was half quart low.
@@Asian_Connection The electrical connector ar the front axle disconnect motor/actuator. Check for corrosion and damage. If good, follow the wire from the connector back to power, ground, etc. MAke sure that are good, clean, and tight.
@@WeberAuto Thank you so much for your guidance. This is very helpful. I will check on that.
thanks for your prompt response. however, looking at the transfer case & front diff of my `96 land cruiser I don't see an ADD switch, as you mentioned. this is a full-time 4x4 systems so perhaps there is no such switch to disconnect & reconnect the 4x4 systems. the real question is how do you disconnect & reconnect the 4x4 systems on an older transfer case & diff. could moving the high/low lever next to the gear selector do the trick? does this lever have a neutral position? I look forward to your response. thanks.
+Rupert Gaznabbi You are correct, the full-time AWD system does not have a front ADD, so if your front pinion spins freely, you really have problems! On older systems, the transfer case lever must be in neutral to disconnect engine power from the differentials, or 2WD to disconnect only the front diff. I hope that helps.
ADD huh.. I wonder if it has a hard time staying in place.
I know I'm 6 years late to ask but why is there so many comments written using a translator?
18 dec 2023 5:8 am est ( utc - 5 ) : thanks . just-now i finish fast-forward-and-rewind-repeatedly-and-partially-seeing this movie , not fully-seeing this movie .
That thing looks so expensive
ดีแม็กมีใหมยูทูบ
No one? Ok:
Bueller
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Bueller
Hi , please I need some help , 2 month ago one guy rebuild the axle of my car driver side , after that the car start jumping only when I press the gas pedal , I already replace both axles but the problem still there but feel better than before but the problem still there , what cloud it be , please help.
Do you think the differential is bad already , when I took out the axle I saw has no grease only little do you thing this could damage the differential
My cars is Bmw 2013 f10 5 series xdrive it looks like this one
I am sorry to hear that, thanks for watching
Why is he calling it Propeller shaft and not Drive shaft? even so far as to correct himself mid speech.
Because that’s what it’s called!
Benjamin
Can U speak slower .....
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