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Re: (e30) Thumping sound in the trunk area/whee well?

  This is likely a bad shock mount. The sound is like a dull thud
when you go over rough spots. Note: the rough spots need not be very rough.
You should be able to check this either by removing the shock tower cover
in the trunk and bouncing the car. Look for motion of the shock mount
relative to the fender well. Also check for rust in the fender well.
This can cause the entire fender well to flex. But thins have to be pretty
neglected for this to happen.  Also you can check by looking at the shock
directly behind the wheel. Reach in the wheel well and grab hold of the
shock and try to move it side to side. 

john k...