I have a 1991 caprice and I want to know the cause of this continous rattling noise while driving on a mildly ridged road. It's highly annoying. I replaced upper lower ball joints, sway bar link kit, shocks were severely worn, and brake pads, anything that could have a little play while driving like worn ball joints its loose. I've looked at just about everything that could cause because I can hear under my left rim in the front. Please some one wiser, pointme in the right direction.