I've had the same problem with my '00 LS Sport. After replacing the struts, I decided to go after the Stabilizer Bar links, as they are reasonably cheap. When I removed the passenger side link, I found the source of my suspension "clunk". The sway bar bushing on the passenger side is totally shot. With the "dogbone" removed, I can easily move the unattached sway bar and make the "clunk" without the car even moving. Fortunately replacement sway bar bushings are reasonably cheap, too. You just have to know what size sway bar you have. V8s are different from V6s, and sport packages are different from non-sport models. For the best on-line prices I've found so far, go to
www.burdford.com. They're in Indiana and deeply discount all their OEM Ford/Lincoln parts.