I replaced the rack and ran into another problem, leaking power steering lines. solved the pressure hose by fitting new one but the return line o ring in the nut that screws into the rack was leaking and you cannot find the return line complete with fitting only the stock rubber hose you cut to length. Very annoying, have tried all usual Mustang part sources and ebay. Wrecking yard looks the best bet. You cannot replace the o ring on the return line as it is a sharp right angle fitting and cannot draw back the nut to reveal the o ring.
Anyway, the CREAK/clunk. The rack did not cure!! I replaced the sway bar rubber but still no better despite being worn. The struts are fairly new by the looks of them. Suspect problems are the rubber mounts at top of struts but not sure. This clunk happens every time I hit the gas in a straight line from the stop light. A pronounced creak more than a clunk.
Be pleased to know if anyone else has experienced the same.
Thanks
Steve