RE: Troll under my car?
sound didn't work...
if you believe it to be the rear. jack up both rear tires. and spin them both. one by one in the same direction. then opposites, then both in the same and both in opposites. try rocking the tire in both direction as fast as possible.
your trying to recreate the knock in the rear diff. if not your atleast ruling it out.
then start checking suspension. rear sway bar bushings... look for anything cracked, bent, or broken.
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Audi Technician
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