Trying to locate that clunk in the rear end when you turn or accelerate?
 

Work from the top down and outside in.

Mine turned out to be a totally shot bushing. Spcifically the bushing where the rear ACE actuator connects to the sway bar mount. It's way up there and can be easily missed.

Check list:
Shock hardware tight?
Sway bar links tight and solid bushings?
ACE actuator bushing solid?
Watts linkage solid?

If you check these you will find one or more is in need of service.