Failed Chevy Silverado 4x4 NP246 Transfercase Teardown! 4 Button GMT800 Transfercase Autopsy!
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- Опубліковано 14 жов 2024
- A transfercase? WHAT? Yeah, I know. Its weird. I felt this was an opportunity to both learn and provide similar but different content. This is the blown transfercase from a 2004 GMC Sierra Z71. This is an NP246, 4 button style transfercase found in many GMT800 vehicles, which are 99-07(classic) GM Fullsize trucks and SUVs. I bought this truck after it was misdiagnosed as a bad rear end. The noises it made... well... they were pretty terrible. I put a good transfercase in the truck as I intend to keep the truck on the road and I figured the old one would make a good teardown. This is the first transfercase of this style I've ever had apart and its clear I don't quite have the necessary tooling to do this regularly. This was just for fun though as this T-case would end up in the scrap bin either way.
My name is Eric and I own and run a full service auto salvage business called Importapart located in the Saint Louis MO area. Part of our model is dismantling and selling parts from rare and niche market engines. I don't build or rebuild engines, we simply supply hard parts to those that do!
Want to see a particular engine torn down? I may have already done one! No really, check out my other videos for the engine you'd like to see! I've made over 60 other teardowns from a Cummins to an LS7, and from Rotary to Ram Ecodiesels. You can expect a new teardown every week!
Check them out here • Blown Up Engine Tear D...
As always I appreciate all of the comments, feedback and even the criticism.
Catch you on the next teardown!
-Eric
Love that you're branching out into other automotive teardowns. Always enjoy seeing the carnage as a result of neglect and abuse. Keep up the great videos!
Agreed… gearbox, diff carnage 🤔
Why you're successful has a lot to do with your voice and personality. You don't act like a know it all. There's some humility there. Quite a good thing. You let the audience identify with the goal of the teardown. You are like the brother or cousin we always wanted: a mixture of warmth, humor and knowledge that let's us be part of the job.
Joe Thorsen
Cool story bro.
Also... No drawn out boring intros, No bad music, no endless, pointless monologs. He says hello, briefly explains what's coming and then goes to work. That's the key to his success.
And the sophomoric humor. Has me laughing throughout the vids.
And that it's apparent Eric loves this stuff (as much as we do).
I agree, great to hear!
@@mann_idonotreadreplies shhh
Lookup Precision Transmission youtube channel for teardowns on domestic RWD transmissions and transfer cases. Richard has an excellent video showing how to teardown that exact transfer case. You did very great for not having the snap ring pliers.
Richard is practically the same format. Walks in, little background, grabs the impact and goes right to work.
Another vote for Richard and Precision Transmissions. If you’re ever going to teardown a transfer case or transmission, that channel is phenomenal. Love all your videos and looking forward to the next one!
Was gonna say, I think Richard has done the same model a few times now. Good reference material.
Just checked them out from your suggestion and wow! Started binging videos lol. Guy clearly knows his stuff watching him tear a tranny apart with ease.
Yeah, PT is very good.
Really enjoyed this! I've never seen inside a transfer case before making this really interesting. Thanks!
np 208, 4 cogs, thats it. these things have oil pumps,in a t/box. for the chain, weak..best t/box, 208.indistructable.
Wow what a surprise, midweek Transfer Case carnage! Love it dude, thanks for the little bonus! I definitely wouldn't be mad to see more things like this lol
You were definitely right about us pros chuckling. I can gut one of those cases in less than 5 minutes once it hits the bench. I love building t-cases!
That one was a special kind of destroyed though.
This era NPG xfer cases are notorious for pump rub where the sharp edges of the oil pump rattle their way through the softer magnesium case. There is a steal clip to prevent this, sometimes it comes off. Over time pin hole leaks form and invariably remain undetected as the oil sprays out in a fine vapor leaving no visible leak. An aftermarker kit replaces the sharp factory sharp edges with more surface area so as not to wear through the case. On my 05 Dmax at 90k I pulled mine as PM and replaced the back 1/2 with a AL case and left the pump as is, also replaced the seals and forks.
Love that you "switched gears" on your tear downs.
Boooooo!
*upvotes
Lock up on your way out
I used to build AWD transfer cases for Chrysler. It's fun to see one of these put through it's paces after handling so many new ones.
The great thing about Eric is we all get to learn together
Good video, I've never seen the inside of a transfercase before.
I love the video, I had a seal go out on my 2005 2500hd, fortunately I caught it before damage was done. Oil is an important component in these machines. Not sure how people are not aware of that.
That's a necropsy, not an autopsy ;) Love your videos!
You're reaching people. Last night before my 8 hour trip today, I checked the oil in my CR-V. Actually stopped to look at engine, the manifolds and all the other stuff I didn't know. Then wondered if Eric would show a side mounted engine with the transmission attached. Food for thought. Great videos.
you need to check out precision transmission for their teardown mostly gearboxes but some transfer cases (some carnage but nothing on that scale :) ).
You make tearing stuff apart entertaining, no matter what it is. I can't help but wonder, do you think out loud even when you aren't on camera?
??...what.??...who said that. ??...
i still want to see a teardown from start to finish lol
@@plageran - Well, watch one! What's your problem, ADHD?
@@johncoops6897 I think he's talking about the un-edited version. If I made one there would be a lot of stupid mistakes and swearing :)
@@jamescole6846 - Oh, ummm... errr... an un-edited version. Oh yeah, that does make the comment make more sense!
But hell that would be super boring, especially the bits when he repositions the camera to get a better shot of some aspect of the disassembly.
Imagine listening in real time to the rattle gun take 5 or 10 seconds to undo each bolt, rather than "Pew Pew Pew Pew" like a laser. Eric walking off to find a tool, or put the parts over on the main table, or needing to take a leak, or even taking a dump and then coming back some time later... would the camera follow all of that too?
Owner ran it dry and it ate itself. Now scrap metal. Nice teardown. I always check the oil and filter. Hell, I cut every filter open to check for sparkles. Nice job.
Those bolts looked weird because they're designed to not provide a ground path. The front of the case is aluminum, the rear is magnesium. The oil pump is aluminum, and it wears through the mag case which causes the fluid to drip out. Pretty much every case from that era of GM vehicles is bad or has been repaired. Another problem is there’s no sensor to indicate high temp or low oil, nor is there a check interval. Just replace every 45000 miles or so. A lot of damage could occur in that 45000 miles. This is a bad design, not a failure to maintain.
Also make sure to use the correct fluid type, Auto-Trak II. It needs the friction modifier since it has friction disks for the automatic transfer engagement. Weird things happen if regular gear oil is used.
The GMT 800 trucks with auto-4 take auto trak 2. It's a blue fluid, kind of unmistakable. The gmt900 trucks just call for atf. I don't think you're suposed to, but I've heard of guys running atf in the older units without problems
I remember on the Benz forum for Benz's suv when I was troubleshooting if my transfer case was bad, that one thing was lot of transfer case go bad, and guy explain that in order to service them you had to remove the drive shaft to get access to both the refill and drain plug and the dealership doesn't do because it a very huge hassle to do it.
@@carterthiessen2664 Not all GMT800s run auto track. The non-auto track take DEX-III or higher. Some people insist on running 5-20 synthetic.
when you change your oil, every 5 th k,s. diesel. you should look for leaks, check levels. oil does not dissapear. old, even some new, toyotas, leak from the t/box, to the g/box, so people,toyota drivers that know sht, just think its the g/box, then the t/box blows up,,why did that hapen,?. do,,your,,own,,maintenance..
Likely out of oil from pump rub. Was a thing on some of the early cases. there is a kit, but yours is way way past that stage lol. I love the fearless tear downs. It is how you learn and your style is really entertaining, Keep up the good work.
Last time I did mechanic work a jeep rolls in with a noisy driveline, up in the air and the chain wore through the case of a NP 231, dry of course.
I love the engine teardowns. That said, this was cool. Cool to see different stuff on the channel. Keep up the great work.
Thanks for the midweek teardown fix. Won't have to be jonesing til Sat.
Bonus - nice treat after a crappy day climbing up and down ladders. Thanks Eric
It's so nice that people don't maintain their vehicles, they help mechanics stay in business, parts suppliers happy too. Also, credit cards companies love these customers, they keep getting dipper into debt and helps credit card companies never go out of business. Good job people!
I wonder how many High School auto students will get to see this one? We all love watching or participating in taking things apart. Thank you for doing these, it’s always fun!
nah,,just stik the obd 4 in the shaft, & diagnose,,needs a new one..
Thanks! I changed my transfer fluid at 65 thou miles. Same with the diffs. Its a cheap maintainance item, and easy to perform at home.
Somebody paid attention in geometry class! Excellent use of the word “fulcrum” 😁😁
Until I watched this video, I had no idea how transfers cases work. It’s pretty easy to form a general idea now how they work. Thanks.
You need to use snap ring pliers to spread the snap ring to release the bearing.
I'm pretty sure he knows that as he said he didn't have them because he's home and not at a shop
No shit! He was at home and didn't have one so he made do
Love it. Keep the coming. Do a transmission next
I've recently realized I only watch this guys videos for the carnage he tears down...another satisfying video!
Two GMT800s in the driveway? I see you’re a man of culture
Great tear-down, very informative. But I really don't need to check my oil levels,
they come full from the factory.
I watched Eric O rebuild one of these on his channel it looked very complicated
thanks for letting us see the carnage due to lack of fluid !
I had always wondered and now I know! Thanks for the video!
all taerdowns are fun to watch! thought that would been huge mess inside but nope!
I love watching your tear downs. Engine, transmission, t case. Keep it up man.
Much needed video used my 4wd this winter and was smelling burnt clutch reminded me off checking the case
My current truck (bought used) has this same transfer case. When I got it there was a couple ounces of black goo that came out of it. It had the infamous pump rub vent holes. Refilled it & amazingly it still worked. I nursed it until i found a used unit to replace it. This piece you have died a much worse death than mine...dang!
I had the same problem with my 2004 and I fixed the pump rub hole with JB weld till I could get it repaired.The hole is usually at the top and it only leaks when driving so you don`t even know you losing oil.
I can't believe it, I heard that rattling the moment you stood it up. I'm NOT a mechanic but even I knew it shouldn't be making that sound. I'll never use the knowledge you impart but I really enjoy your videos.
Mid Week Videos are always welcome. Keep 'em coming.
Another entertaining video. Loving your content. You'll be at a million subs in no time.
It’s nice that your tearing down a transfer case from a 4wd truck! At least your changing up the tear downs a little bit! It’s different than the engine tear downs! Those trucks sell like hotcakes!!! Hope you sell it soon!!
Never been this early to an upload. Favorite channel here.
Excited to see a component teardown like this. Thanks for posting!
It's always great when your car sound's like you scored a JackPot at the slot machines...
I used to have a 2002 Z71 and it never had transfer case problems. Ironically, I cracked the housing accidentally over-tightening the drain plug after changing the fluid as part of routine maintenance so I ended up having to get a new one
Yep, I saw Transfer case, and said "I gotta watch this!"
I love these tear down videos from Eric and those cow hoof repair videos too.
I think that chain would look good plated in gold and worn out to the club.
Eric, if you want a crash course in taking transfer cases apart watch Richard on the Precision Transmission channel, and yes you did need to get the clip under the rubber cover out. Love your videos, learnt so much watching you dismantle engines.
i appreciated the different video from the norm, its all still related to teardowns and car parts in my opinion. your teardowns combined with very good camera angles, and the very little skipping done in favor of speeding up the video like its a half timelapse, half realtime teardown is unique in of itself. honestly couldnt even complain if it was bodywork or rebuilds either. im sure youd give them the same format as above. would be interesting to see.
Nice different video. That was NASTY and frankly I am surprised it just didn't grenade on the truck like I have seen pictures of others that failed. I also follow another channel, Precision Transmission, and watch some of their tear downs including the transfer case. They have had some that decided to fragment onto the pavement and one, into the cab. Happy for the extra video. Well done.
I did enjoy the Chevy Silverado ad I got from YT halfway through this.
It should be an oil commercial
Really interesting for me. I have an '01 Duramax that threw a driveshaft, so now it's a parts car. (Almost 400k miles.) I'm hoping the transfer case is okay, since it and the transmission were rebuild not that long ago.
Sidenote: It took the tansmission shop months to diagnose the transmission, replaceing just about everything but the planetary sets. Turns out the magnetic ring the trans computer uses to sense shaft speed was cracked, causing confusion. Only testing signals with an oscilloscope tracked it down.
Mad props to the hammer holding it up.
Better than a Durango I worked on when I used to work for Pep Boys. Lady comes in saying it's shaking, and I told her it's the front driveshaft that's bad and don't drive it. She kept driving it and the driveshaft tore the transfer case almost in half. We had to send to old one back as a core, and there was a tag that said "Drain all fluids from core before returning" so I left a note saying "No fluids here lol" I wish I could've seen their reaction to that
This was cool. It was a nice change. You’re famous for engine carnage, but I think we would watch a teardown of any decimated or neglected component. Excellent video.
Love this video. I like the different things you do. And I always wondered what a transfer case looked like inside. Huge chain!
really enjoyed the "new" material :) like so many other viewers have said, I could watch you tear down just about anything and enjoy the whole video. thanks again for another good noe!
Thanks!
I loved this, since I watch trans rebuild videos pretty often! 😃
Loved every minute of it - maybe some blown diffs, manual/auto/dsg gearboxes on the schedule one day? Keep em coming Eric!!!
Good day from Ontario. Yes it was a good video Shows us what we should do or not. Picture worth thousand words. Thanks
if you want to save one next time and rebuild it, the snap ring you accessed from the outside of the tail housing should be released first and if you get that snap ring in the correct position then it releases the bearing so you pull the tail case off and everything stays attached to the front case half. it takes some fiddling to get it just right to release and yours may have been stuck due to the carnage. i've seen that type of damage before when somebody put a reman transfer case in and forgot to put the fluid in. they will run for quite a few miles like that before shredding everything. fun stuff keep em comin.
You should have seen the one we pulled from my dad's 2500HD sierra... The front shift fork was worn down to a knife blade so it kept popping into transfer case neutral rendering the truck useless untill you got it to pop back in which was not a guarantee. You really should change the fluid in them periodically lol. The pump blew up which caused the failure on his.
That e34 with style 5s is looking good!
I just sold one of those with 200,000 miles, including many on the highway in 4wd. It was never a problem.
The highway was always snow covered, or it was in auto 4wd. It also got the fluid changed every 2 years with the proper blue GM fluid.
That's exactly how u drive on highway with 4x4 on....this guy must of accidently put it in 4 low if that's what took it out but I think it just was out of oil because there were no holes in the case.
Cool it was fun to see something different 👍
Definitely would like to see more transmission tear downs!!
Go to precision transmission channel. He does alot lol
@@trentdaddydolla647 I've seen that channel but would like to see a different perspective and TBH, different transmissions!!
Sounded like, "Clanking champagne glass and a chipper/shredder." Hilarious!
If that case was from NY you probably wouldn't even recognize the bolts. For whatever reason they had bad corrosion issues where the bolts met the case. No fluid saves weight for fuel economy, but the drag takes away the fuel economy. Seen quite a few of these with either black fluid or bone dry. Cool teardown.
Have a quick look at Precision Transmission channel , they have pulled apart heaps . They give you the secret of the big circlip . Great vid as always . Thanks.
When you said only dust came out... I wasn't expecting it to actually be dust.
Cool I've never seen what the inside of a transfer case looks like before.
Malice in the shift palace love it
Wow a mid week special I really feel special
Liked the comment, dust came out of the drain plug... 1st time for everything...I've never gotten used to the smell of old diff fluid...It freaking reeks
That was fascinating to see. Thank you Eric
T-Case tear down…SWEET !
I don’t think that’s the “case” either. 😁👍 Nice getting a video on a Thursday.
Just in case you wanted to know more about transfer cases, here is a video by the master dissembling a transfer case. Very informative. By the way, that's an old autopsy table he uses for tear- downs. ua-cam.com/video/BjxZykMlEuE/v-deo.html
Must be Precision Transmissions from Amarillo, Texas
Never did care for that table, now I like it even less.
No oil and it broke? Imagine that.
I had a 246 in my 97 gmt400 Silverado. I neglected to get around to taking care of the stripped fill plug, and one fine summer day driving through town with the windows open, I became aware of a disturbing rubbing noise coming from under my 300k mile rot box. It was my bone dry transferase slinging the chain against the case. Front shaft output bearing was toast. While attempting to investigate, the case shattered and I had to buy a used tcase. Once open, I found pretty much exactly the interior condition shown here. Whoops!
That's an autotrac. Those sensors monitor front and rear driveshaft speed. If there's a difference, ut send a signal to the transfer case module and the motor engages a clutch pack to bring the front and rear driveshafts to the same speed
Thank's for the midweek adventure
70% of the cars that come into our 2,200 car yard here come in for no reason other than "no oil", it is all makes from Nissan, Chevy, Ford, Honda, all, people literally just run their vehicles dry on engine oil... same for bad rear axles-most are just dry... People just will not check fluids... Even if a transmission, axle, or transfer case drips 1 drop of fluid per day-that will add up...remember some of these are not checked for 10-15 years.... honestly people just don't care...
Great video..
Great video.
A nice Thursday surprise.
At my shop (Trans shop) we occasionally see a t case with a small hole on the passenger side upper section. We have a "case saver" we install (I don't so I'm not sure what it is) or if the customer wants the bare minimum we jb weld the hole shut so it won't sling all the fluid out. And let me tell you. The amount of people running around with the t case about to go is insane. Most of the ones we check (pulling the Trans out might as well) are incredibly low
You took that apart like a home mechanic :)
I check the transfer case and diff levels about twice a month. That is overkill but it is so easy to do with just a couple of ramps and a floor jack for the rear diff. Sometimes I just drive it up on the curb. The front diff requires nothing more than a wrench.
I like the E34 behind you
Seeing a notification on Thursday had my finger catch fire hitting it so fast lol always a good day when you post!
I had an NP208 case grenade on me in Michigan City Indiana about twenty years ago. The high/low shift fork was riding against the shift collar, and eventually wore through it (common issue on that case), but mine did an extra trick where as the fork came off the collar, it snagged the large main snap ring, and pushed it through the side of the case. This happened within seconds of passing the "Welcome to Indiana" sign, and I was able to just limp it into the rest stop. Luckily I was towing my old Subaru as part of a cross country move, and was able to go into town to get a replacement case and continue my journey. Unfortunately, the case at some point had been filled with 90wt, and this was now completely covering my car. It took a while roll of towels to clean off the windshield.
It'll keep your Subaru from rusting
@@notme8121 It was a bit late for that one, unfortunately
Good to learn about. My truck has this transfer case.
Watching at work ☺️ what a Thursday treat! Now my manager watches too 🐱
The pump probably wore a small hole through the case and ran it dry. Need snap ring pliers for ring on bearing in the back
Sweet Chain is one of my favorite Lou Reed songs.
Well done!
I'm not into cars but i really like your mechanical autopsy videos.
Engines, Transmissions, Transfer Cases, and Rearends all require lubrication. Run any of them without oil and the result is catastrophic. CHECK YOUR OIL.
Such a simple thing, but so many do not. Work security!
I checked all mine before a long trip and half way into the trip it failed. It didn't leak prior to and was empty and tore up 150 miles later. I didn't even bother opening it up, there was plenty of chunks in the drain hole.
@@chadalcock7275 Damn
Seen one grenade cause a guy drove in 4 high on the highway with brand new rear tires and bald fronts. They were technically the same size but there was a good inch difference in diameter. Stretched the chain so much it started jumping teeth then piled up and blew out the side of the case. Don't drive in 4 HI on dry pavement, especially if your tires aren't perfectly the same size
or,turn corners, best is, when you buy a 4x4, JOIN A FKN CLUB, KNOW YOUR VEHICLE. do you own maintenance. if not, DONT BUY ONE.