2021 Tahoe Needs New Rear-End!

[HollyMillerBopp850]

I have a 2021 Tahoe. It had been making a noise for almost a year. The dealership kept saying they couldn’t get it to recreate the noise over and over again. At my last service the noise was really loud, they heard it and said that it just needed differential fluid changed. Brought vehicle home, noise was much worse and I was almost at my 60,000 mile warranty. Took Tahoe back to dealership and after 4 weeks it was determined it needs a new rear end. And now the issue is getting one because apparently none are in stock. Dealer offers no loaner cars, GM has no policy on rentals other than they may reimburse up to $50 per day. We are now on week 7, no rear end and car is still sitting. Very disappointing!!!
 

GE has been extremely difficult to work with. Everyone works from home or provides extensions that disconnect call. No one has any answers as if this is just okay. 

Edited March 26, 2024 by HollyMillerBopp850

[newdude]

16 hours ago, HollyMillerBopp850 said:

 

I have a 2021 Tahoe. It had been making a noise for almost a year. The dealership kept saying they couldn’t get it to recreate the noise over and over again. At my last service the noise was really loud, they heard it and said that it just needed differential fluid changed. Brought vehicle home, noise was much worse and I was almost at my 60,000 mile warranty. Took Tahoe back to dealership and after 4 weeks it was determined it needs a new rear end. And now the issue is getting one because apparently none are in stock. Dealer offers no loaner cars, GE has no policy on rentals other than they may reimburse up to $50 per day. We are now on week 7, no rear end and car is still sitting. Very disappointing!!!
 

GE has been extremely difficult to work with. Everyone works from home or provides extensions that disconnect call. No one has any answers as if this is just okay. 

 

 

GE?  General Electric?

[HollyMillerBopp850]

Fixed the typo

[E cruz553]

i fixed my 2021 suburban with the following 3 products and saved thousands because after dealing with this problem for over a year i was going to buy a new differential but before I pulled the trigger I decided to give this cheap solution a try and it worked 100% i have zero noise or vibrations it drives perfect

Ilove

my car again. Make sure you get 2 bottles of the ACDelco 10-4091 because differential fluid capacity is almost 2 quarts.

easy DIY project just need a little hand pump to put in the new fluid after draining the old fluid. drain plug is located at the bottom and fill up plug is at the back of the differential

[fondupot]

I took E Cuz553’s advice and changed my diff fluid and added the two additives. Quieted down my G86. Heres my video:

 

 

[diyer2]

Amsoil would be my choice.

[txab]

11 hours ago, diyer2 said:

Amsoil would be my choice.

Except in Amsoil's chart they say "No AMSOIL Product Recommendation" for the G86.

 

The problem Fondupot references may be why. Would be interesting to hear from Nick

[diyer2]

Good to know, thanks.

[studly]

GM Recalls 460,000 Vehicles for Rear Wheel Lock-Up Risk

https://www.theepochtimes.com/business/gm-recalls-460000-vehicles-for-rear-wheel-lock-up-risk-5759400

 

[fondupot]

On 11/13/2024 at 7:36 PM, studly said:

GM Recalls 460,000 Vehicles for Rear Wheel Lock-Up Risk

https://www.theepochtimes.com/business/gm-recalls-460000-vehicles-for-rear-wheel-lock-up-risk-5759400

 

 

That is unrelated. That is for diesel models only, and it's a transmission valve recall not the rear differential.

 

However there is a TSB for the rear differentials on Tahoe, Yukon, Suburban etc. that calls for flushing the fluid several times, or replacing the diff.

[Black02Silverado]

Yes, AMSOIL only has fluid for the G96 and nothing for the G86.  To me there seems to be an issue with the build/materials used in the G86 for there to be so many issues that I'm seeing. If the suggested fluid change out and additive suggested above works then I would try it.  Beats going to the hassle of dealing with the dealer and it's an easy task.

[Davenport1]

I have a 2021 Yukon SLT Diesel and it's been in the shop waiting on a Rear Differential for over a months now! It's still under powertrain warranty, which is a good thing but also is screwing me.  I could get an aftermarket rear differential today and it would be good to go. But then my warranty will be null and void. GM has pushed back the delivery date of the differential 3 times now. This is completely erroneous. And now the suggested that I the part will be delivered is Feb 4th. I'm getting really fed up with this.  

 

Has anyone had any luck with getting GM to start making parts or how long did it take for you to get a new rear differential? 

[GMCustomerService]

On 1/7/2025 at 10:07 AM, Davenport1 said:

I have a 2021 Yukon SLT Diesel and it's been in the shop waiting on a Rear Differential for over a months now! It's still under powertrain warranty, which is a good thing but also is screwing me.  I could get an aftermarket rear differential today and it would be good to go. But then my warranty will be null and void. GM has pushed back the delivery date of the differential 3 times now. This is completely erroneous. And now the suggested that I the part will be delivered is Feb 4th. I'm getting really fed up with this.  

 

Has anyone had any luck with getting GM to start making parts or how long did it take for you to get a new rear differential? 

We truly understand how part delays can be disheartening, and our team would like to take the time to learn more about this matter and assist. Please send us an email to [email protected]. Make sure to include your Username and Forum name in the subject line with additional details. We hope to hear from you. 

[cre44]

On 11/15/2024 at 6:40 AM, fondupot said:

 

That is unrelated. That is for diesel models only, and it's a transmission valve recall not the rear differential.

 

However there is a TSB for the rear differentials on Tahoe, Yukon, Suburban etc. that calls for flushing the fluid several times, or replacing the diff.

What is several times? Ive gotten one flush already. My vin wasn't on the recall for the rear end, but I know that's what it is after dealing with the noise on slow turns for a year now. They gave the flush 2 months ago. When I picked it up they said if the noise didn't go away I still needed to wait for 300 miles before I could bring it back. The noise did go away for like two weeks, but now it's back.

[fondupot]

2 minutes ago, cre44 said:

What is several times? Ive gotten one flush already. My vin wasn't on the recall for the rear end, but I know that's what it is after dealing with the noise on slow turns for a year now. They gave the flush 2 months ago. When I picked it up they said if the noise didn't go away I still needed to wait for 300 miles before I could bring it back. The noise did go away for like two weeks, but now it's back.

 

I believe it's 3 times.

 

I would just do the diff fluid yourself and add the additives shown in this video. Did it to my Yukon and its been quiet for over 1000 miles. It should solve your issue.