[EdwardDeanSmith]

I've got a 2017 colorado duramax. After 82,000 miles, I'm having to replace to rear differencial for a second time. No after market rears. I never had a problem like this in a chevy truck before. I'm replacing it with a used one now. I'm a little disappointed with Chevy and loosing confidence. Anyone experiencing to same issue?

 

[EdwardDeanSmith]

Why can't chevy build a product they can stand behind?

 

[SFLTruck]

Why can't chevy build a product they can stand behind?

What's actually going bad in them? This is the first time, in reading for years, I've seen this issue.
curiosity is peaked !

 

[EdwardDeanSmith]

Its second time the diff had gone out in it. First after 22000miles. Now again at 82000. There's something wrong with the original diff. Right now I'm replacing it with a used one. I've never had a problem with ant trar diff. I'm afraid to take it to the dealer. No faith in Chriswell

 

[SFLTruck]

Can you elaborate on the "gone out" part? bearings, seals, carrier, pinion, spider gears and so on.....

 

[EdwardDeanSmith]

This was the breakdown after 22000. At 82000, they've told me its not covered under warranty. I had a local mechanic look at it. He was going to replace the bearings etc but with it having the same issue, I'd rather replace it and try to avoid it happening again.

 

[SFLTruck]

This was the breakdown after 22000. At 82000, they've told me its not covered under warranty. I had a local mechanic look at it. He was going to replace the bearings etc but with it having the same issue, I'd rather replace it and try to avoid it happening again.

Starts to make you think that there's a defect in the housing causing a misalignment and maybe side-loading the bearings or something like that.

 

[EdwardDeanSmith]

Agreed

 

[RollyPollieBenito]

Have you consider taking it to a driveline/axle specialist? They can tell you if the axle housing are not aligned properly.

 

[EdwardDeanSmith]

Bearings are galled and metal in the fluid. Yes there's a misalignment. Chevy has told me they wouldn't warranty it. I'll fix it, sell it and cut my losses.

 

[RollyPollieBenito]

Bearings are galled and metal in the fluid. Yes there's a misalignment. Chevy has told me they wouldn't warranty it. I'll fix it, sell it and cut my losses.

honestly, if the Rear axle is the only issue, I would try to find a complete use one from a wreckage yard, get it completely looked over and continue to drive it.

 

[EdwardDeanSmith]

Thats exactly what I'm doing. It should be here Wednesday or Thursday.

 

[Florida beachbum]

This was the breakdown after 22000. At 82000, they've told me its not covered under warranty. I had a local mechanic look at it. He was going to replace the bearings etc but with it having the same issue, I'd rather replace it and try to avoid it happening again.

On all three of my last new trucks the rear diff has been low on fluid right off the lot. One very low. I have the dealer check all the levels before i drive off the lot.

 

[bigoilbob]

Starts to make you think that there's a defect in the housing causing a misalignment and maybe side-loading the bearings or something like that.

Would there be extra metal on the mag plug when inspected/cleaned during a fluid change? Yes, my plug had almost no material stuck to it during my change at ~45K miles, and I'm selfishly hoping that I don't have the same problem.

But I also empathize with Smith. Seems like he should have redress if he bought a bent housing, no matter the formal warranty terms.

 

[bigoilbob]

On all three of my last new trucks the rear diff has been low on fluid right off the lot. One very low. I have the dealer check all the levels before i drive off the lot.

My 2018 CCLB Z71 was full of fairly clean fluid, when I changed it at ~45K miles. No larger claim, just one more data point.....

 

[FFPaul]

I’m searching This forum because I just got back from an 8k rv trailer trip. The trailer is 5k loaded. I’ve got a whine like the rear end is going. I changed the fluid before leaving on this trip at 63k miles. The fluid was pretty dirty but no metal chunks and no noise then. I’m going to change the fluid again and look for metal. Wish me luck.

 

[FFPaul]

Well, here’s the photos. Looks like a bad bearing flaking apart.

 

[bigoilbob]

Well, here’s the photos. Looks like a bad bearing flaking apart. View attachment 9233 View attachment 9234

"Liked" your post, but not your mechanical problem. Glad you caught it in time, and thanks for the pix. Will you get a professional opinion on any possible, avoidable, root cause? From your comments, you were within service limits. We would certainly all benefit from anything you learn.

 

[FFPaul]

I’m going to take the center pumpkin to a reared shop for bearing replacement and evaluation. I will let you know what I’m told. Thanks

 

[FFPaul]

So, the shop said it looks like a bearing with a lot more miles on it. The other side carrier bearing looked normal. So were not sure if it was a bad bearing metal that flaked apart? I was pulling a 5k pound trailer at 65-70mph on the freeway. My mileage was anywhere From 10.5-13.5mpg. So could the oil have broken down from excessive heat? No clear answer yet. At 63k I removed factory oil and replaced with Amsoil blue label 75w90 synthetic. 8k later junk bearings.