Rear end issues.

20Denali22 · January 10

I have a 21 Yukon w almost 40k miles on it now and the rear end is having issues. At slow speeds after the vehicle has sat over night, the rear end locks up until we get a mile or 2 on it. After that, it drives normal. It makes a grinding whining noise like a 4wd making a 90° turn. Fluid was full as well.

Dealer called and said only the fluid has to be changed and no damage was done to the diff. I would've thought after all the grinding and whining noises sometimes would've been damaged. Is changing the fluid only putting a Bandaid on it?

20Denali22 · January 12

Apparently it's fairly common. Service bulletin for those that need it in the future.

HollyMillerBopp850 · March 25

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!!!

Edited March 26 by HollyMillerBopp850