It might have esp but, I never heard one clunk. Drop the sway bar center bushing, put a little white grease in 'em and reattach the bar. While your there, run over the front end and look for ant busted boots on the joints and take the bar while lower and move the outer sway bar links around and see if they are dry and sticking.
Project Smoker, '87 603 powered wagon
Hauler, 96 CTD can you say torque?
Toy 73 Cougar xr7 convertible
Acme Automotive Inc.