You're not providing enough info. to make an informed response. My experience with the dreaded rr suspension "clunk" is the sway bar, although the upper strut mounts can also be the culprit. Often, the offending component(s) are invisible until you begin dissasembling parts.

Is your rr sway bar stock or aftermarket? If it's aftermarket, whose is it? What are the conditions when you hear the clunk-possibly going up/down your driveway? Is 1 side of the rr suspension under a compression load while the other is in extension? And on & on....

Help me out with this info., and in turn, I can help you.

Redcoat Raceworks. Performance parts and custom fabricating for Contours, Mystiques and Cougars. Specializing in chassis and suspension parts. Custom end links, control arms, strut tower bars, engine torque braces, etc.