Also, check the rear trailing arm bushings....they are prone to fail..... when the bushings fail, the trailing arm knocks against the rear subframe of the car........ links below:
Symptoms of bad trailing arm bushings include side movement of the rear end under acceleration, general looseness of the rear over bumps, and abnormal tire wear. These bushings will start wearing out after about 50,000mi, give or take. As you'll see in this DIY, I made a special puller/press tool for dealing with this stubborn bushing, but it wasn't good enough for removal. So I had to go butcher style, which is an option many choose instead of paying out your ass for the tool.
BMW E36 RTAB Without Special Tools E36 RTAB DIY with BMW Tools w/ or w/o GC shims - Bimmerforums - The Ultimate BMW Forum
johnny,