Rear End - Differential - Car Forums

I believe I've got the same problem on my Safari 2002 AWD. One mechanic said that he thinks it has to do with a clutch-type plate in the rear differential which is slipping, creating a kind of thumping under acceleration and even deceleration. His solution is to open up the differential, replace the fluid and add a prescribed GMC additive that will reduce the problem although not completely solve it, at a cost of approximately $125. Apparently he had to do the same job on a RendezVous.
If there's another more accurate analysis of to this problem, I'd like to hear it.
By the way, how can I access the discussion #1636 mentioned in the # 3 box above?

#5 of 6 Re: Rear End - Differential [astrovette] by professorie

Sep 22, 2009 (1:32 pm)

Replying to: astrovette (Oct 01, 2007 6:21 am)

Astrovette:
Thanks for your reply to my question, but how do I get to #1636?
--professorie

#6 of 6 Re: Rear End - Differential [astrovette] by zoner420

Dec 26, 2009 (3:00 am)

Replying to: astrovette (Sep 12, 2007 11:42 am)

i have an 01 astro i just bought it dose the same thing i had an 05 tahoe that did that and i took it in and they said it was the drive shaft that it needed to be repacked with grease so they did it and it stopped for a few months and stated again

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