Dear Smorey... I have a 88 735i which had this seat clunk, or something very similar to what you have explained on the newsgroup...Mine was from the center axel, and I mostly heard this noise (and felt it) when the car accelerated...it probably wouldn't hurt to check it out....I ended up having my whole center axel removed and retooled by a machine shop....hasn't happened since......good luck and please let me know what you find out! toe thing