Thanks for the tip!
Did a little more digging per your response, and I did stumble upon a TSB blurb on some odd web site:
Rear End / U-Joint
Upon acceleration, braking, or hitting a bump a loud thump or clunk is heard coming from the rear suspension. It is caused by a lack of greas in the sliding yolk on the driveshaft and a defective disign in the u-joint. Dealers are re-lubing the splines on the yolk and iserting a rubber ball in the u-joint.
I haven't gotten to test this solution out yet but will ASAP. If anybody is interested I'll report back.
Thanks again!
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Originally Posted by tonytone
Assuming that your tranny is fine otherwise, I believe there is a TSB for the exact symptom you're describing; IIRC it's something to do with the yoke, and that the "band-aid" solution is to regrease it or something like that. I'm sure the GM tech members on this board will come by and clarify what I just said, but I'd look into that, for starters.
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