Quote:
Originally Posted by edpontiac91
I would guess that if you have a POSI rear, that the clunking sound might be the clutches in the rear. Usually when making a turn, the clutches are trying to grab more on one side and they chatter. You might want to put in a GM Additive that is made for this. It used to be whale oil, but they have since changed the formula, but it does work.
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I thought that 4th gens got a cone-stye Auburn or a Zexel Torsen diff... neither with clutches?
Either way, the additive doesn't hurt. I'd put the car on jackstands in neutral and slowly turn each rear wheel by hand. Listen for clunking. Then pull on each wheel and see if there is a lot of play.