Steve, did you ever find out what the problem was.. I have the same prob with mine.. I have replaces so far..:
1. Lower control arm bushing.
2. Lower ball joints.
3. Sway bar bushings.
4. Upper shock bushing..


Still same clunk. I just received my end links.. I will replace them sometime this weekend... Hope that solves it..
I am tired of replacing things..

__________________
Peter L. House
1998 Sport E430
Azure Blue
110,000k Miles

1987 Oldsmobile Cutlass Salon
V8 Bucket Seats
Factory Moon Roof