Did you replace the sway bar bushings? I've replaced these twice on my 01 T&C. It is the primary cause of the clunk you hear every time you hit a bump. I've replace the sway bar arms (right behind the wheels) once or twice too. They are fairly cheap. The rubber is split so you can fit them around the arm. You have to remove the metal retaining clip that hold them in place. I think one end just hooks in and the other has a bolt. It's much easier if you use some non-petroleum based grease to make things slide. The are directional so make sure the correct side is pointing to the rear of the vehicle.