This seems to be a common problem -- mine included. I think it has more to do with the rear sub-frame bushings than anything else. Id bet yours are worn like mine. Jack the car in the rear (not on the sub-frame) and youll probably be able to move the rear wheels around and see what I mean. Thats how I discovered mine where bad (aside from the fact it was obvious from looking at the car from the rear). I was changing the axel seals and had it jacked up...When I lowered it, i noticed it sat up straight! If I remember correctly, I could plainy see the bushings where causing my problem...I have not fixed them yet - -they look like a real bear to fix too! So, GOOD LUCK! HTH.