My sons new project. 2006 GMC Yukon with 4 wheel drive issues?

[1911ly]

I got curious and had to go back out and check the play. There is a little on both sides. But a ton in the diff. I will replace the axles, but the majority seems to be in the diff.

[video=youtube;2JJpZrBhfNY]https://www.youtube.com/watch?v=2JJpZrBhfNY&t=1s[/video]

Thanks Harry and CM for suggesting I recheck it. It was a good call. But I think the problems run deeper.

 

[churchmouse]

Man that sucks.
Those diff's are everywhere used in the bone yards. Get your VIN and match it up. VIN will give the final drive ratio and I am not thinking it will be a 4.10 in that truck. Most likely mid-3's.
I would be surprised if a stealership did the rear axle replace with out checking the VIN and getting the proper part. Easy enough to check if you know how.

 

[1911ly]

Man that sucks.
Those diff's are everywhere used in the bone yards. Get your VIN and match it up. VIN will give the final drive ratio and I am not thinking it will be a 4.10 in that truck. Most likely mid-3's.
I would be surprised if a stealership did the rear axle replace with out checking the VIN and getting the proper part. Easy enough to check if you know how.

All the info I can fine on the net (including some 4 wheel drive forums) say that GT5 on the ID plate is the rear end ratio. I hate to go against what is on the id tag. Odd or not, that is what came with it from GM. The truck might have been a special ordered with it ?

I did find one on Ebay: https://www.ebay.com/itm/99-to-06-C...ash=item440ead07d4:g:DAkAAMXQfvlSlitf&vxp=mtr

I have not checked with a buddy of mine that has a junk yard. He might have something and he should be able to tell me if I am ID'ing the rear end right. I am going figure out what the rear diff is and match it. I know it was swapped.

 

[1911ly]

I just called my buddy at the junk yard. I sent him a picture of the glove box tag and he said it's a GT5 4:10. I am going to look at the rear diff and see if I can find some numbers or pull the cover and get the numbers on the ring gear. I am suspect (gut feeling) that it does not have the right rear end. I will match the front to the rear.

My speedo will be off. I don't know if you can buy gears for the speed sensor like the old days. I am guessing that it is all in the computer now. Oh well.

 

[1911ly]

And my buddy doesn't have one. But another yard south of town does for $400. He also gave me the # of a guy that does his plow trucks. He use to work for GM. He said the guy rebuilt his last year pretty reasonably priced.

 

[BiscuitsandGravy]

My only suggestion is to p/u one of these to help listen inside of things...

Its helps to listen inside of bearings, pumps, etc... Very handy to have around.

https://www.harborfreight.com/mechanics-stethoscope-63296.html

 

[db1959]

The axle code is GT5. I got the info here. GM RPO Codes - Axle & Ratio Identification - Sierra Gear & Axle

A pic of the spec tag in the glove box. Third down, last row. "GT5"

Make sure the VIN on the glove box RPO sheet matches the VIN on thedash. I ran into that problem with my truck. previous owner put in a different dash. Luckily he gave me the old dash.

 

[halfmileharry]

All the info I can fine on the net (including some 4 wheel drive forums) say that GT5 on the ID plate is the rear end ratio. I hate to go against what is on the id tag. Odd or not, that is what came with it from GM. The truck might have been a special ordered with it ?

I did find one on Ebay: https://www.ebay.com/itm/99-to-06-C...ash=item440ead07d4:g:DAkAAMXQfvlSlitf&vxp=mtr

I have not checked with a buddy of mine that has a junk yard. He might have something and he should be able to tell me if I am ID'ing the rear end right. I am going figure out what the rear diff is and match it. I know it was swapped.

We've got one at the shop we've been using for parts for the past 5 years. I'll see if it has any drive train left in it in the morning.

 

[1911ly]

Make sure the VIN on the glove box RPO sheet matches the VIN on thedash. I ran into that problem with my truck. previous owner put in a different dash. Luckily he gave me the old dash.

I just ran out and double checked the tag against the vin. It matches.

We've got one at the shop we've been using for parts for the past 5 years. I'll see if it has any drive train left in it in the morning.

That would be awesome Harry. Thanks.

Harry, am I reading the build tag right? The GT5 is the axle ratio?

 

[SMiller]

I just ran out and double checked the tag against the vin. It matches.




That would be awesome Harry. Thanks.

Harry, am I reading the build tag right? The GT5 is the axle ratio?

You are reading it right, I just cannot figure out how you have 4.10 gears when 3.42 was the only gears available, makes zero sense.

 

[awames76]

I have a 2000 suburban with 3.73. Should be able to change Speedo with a programmer.

 

[1911ly]

You just answered your own question.
What inbred moron said it was easier to pull a load on dry ground in 4WD. Probably killed it.
Memory kicked back in when mentioned they were 2 piece. Nope, no cover.

These are not hard to change.

Make sure the VIN on the glove box RPO sheet matches the VIN on thedash. I ran into that problem with my truck. previous owner put in a different dash. Luckily he gave me the old dash.

You are reading it right, I just cannot figure out how you have 4.10 gears when 3.42 was the only gears available, makes zero sense.

I found a forum yesterday that showed 4 different diff's for this truck. And of course the one I have is the odd one. It has to have been a special order. Someone probably wanted to pull a trailer.

GU4 3:08
GU6 3:42
GT4 3.73
GT5 4:10

I have am appointment next week for a guy to look at it.

 

[1911ly]

Thanks for the info. When I figure out what I have I will check in to that.

 

[ghuns]

CV axles are a pretty cheap and easy to change.

I just bought a 98 K2500 4X4. While doing a brake job, I noticed a tear in one of the boots. I haven't replaced one in years, so I did what I used to do, call South Bend Clutch and asked how much to rebuild it. The guy laughed, then told me, go buy a new one. I though that one for a 3/4 ton truck would be expensive.

$66 on Amazon.

 

[1911ly]

CV axles are a pretty cheap and easy to change.

I just bought a 98 K2500 4X4. While doing a brake job, I noticed a tear in one of the boots. I haven't replaced one in years, so I did what I used to do, call South Bend Clutch and asked how much to rebuild it. The guy laughed, then told me, go buy a new one. I though that one for a 3/4 ton truck would be expensive.

$66 on Amazon.

South Bend Clutch is a great place. I have had them do a lot of clutches & pressure plates, axle's and rack & pinions too in the pass. I am thinking I even had them do a water pump once?

I can believe it's not profitable these days. I hope they stay around. Good people!

 

[Bigtanker]

CV axles are a pretty cheap and easy to change.

I just bought a 98 K2500 4X4. While doing a brake job, I noticed a tear in one of the boots. I haven't replaced one in years, so I did what I used to do, call South Bend Clutch and asked how much to rebuild it. The guy laughed, then told me, go buy a new one. I though that one for a 3/4 ton truck would be expensive.

$66 on Amazon.

Rockauto.com is pretty good too.

 

[ghuns]

I can believe it's not profitable these days. I hope they stay around. Good people!

They'll be just fine. All the farm kids and their souped up diesels will keep SBC afloat.

 

[1911ly]

They'll be just fine. All the farm kids and their souped up diesels will keep SBC afloat.

I sure hope so. I swing them as much work as I can. Whenever someone talks about clutches etc I point them there.

 

[Gary119]

Might check out this link. GM had a problem with the transfer case. May not pertain to your noise but you might want to check if it has a hole / fluid.

https://www.google.com/search?q=hol...droid-verizon&sourceid=chrome-mobile&ie=UTF-8

 

[1911ly]

Might check out this link. GM had a problem with the transfer case. May not pertain to your noise but you might want to check if it has a hole / fluid.

https://www.google.com/search?q=hol...droid-verizon&sourceid=chrome-mobile&ie=UTF-8

That was one of the first things I read on line when I was researching the issue. This case is full. no leaks. And it looks to be newer then the rest of the drive train.