Rear End - Differential

astrovette

I have a 2001 Chevy Astro 2wd w/ 55,300 miles

I recently had the rear end replaced due to a bad diff (as per mechanic). There was a constant noise coming from the rear when I accelerated. Now I'm getting a thumping sound from the rear when I release the brake after stopping. I've been back and forth w/ the mechanic as he does not seem to know what the problem is. First he thought and still thinks its the brakes not releasing properly. I think it may be a bad rear end from the salvage.

Can anyone provide guidance as it's getting riduculous going back and forth to the mechanic

tmcdougall

having the same problem hoping someone can help

astrovette

Look under discussion title: GMC Safari/Chevy Astro #1636 for extensive feedback.

Hope this helps.

professorie

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?

professorie

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

zoner420

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