I am at a total loss on this one. When driving at low speeds (15-30mph) on uneven road surfaces the rear end of my car sounds like the front trailing arm bolts are loose. the same sound can be produced by just pushing down on the rear bumper while the car is parked. I have replaced all rear suspension bushings except for the panhard bar which look to be fine. I have replaced the shocks, the coils, and put on the ipd swaybar. I have removed the shocks, the driveshaft and the upper control arms and still heard the clunk. I have raised the car on a jack at the differential to remove weight from the rear wheels (and wheel bearings)and can still produce the sound! As I said, I am a loss please respond with any ideas you might have.