Does it sound like rubber against metal? Try some silicone grease (Sil-Glyde available at most auto parts stores) between the rubber edge of the upper spring pad in the strut bushing and the outboard areas of the inside of the strut towers. If the upper alignment plates have been drilled out and located farther outboard to get the camber in spec (less negative), there can be a physical interference between the parts mentioned.
Ford made a 1/8" thick spacer plate that fits on top of the upper strut mount and below the top of the strut tower. You must remove the strut and spring from the car to install it though. This sound will be more frequently reported by many SHO owners now that the weather is getting wetter and colder. I just lubricated mine last week for those reasons.
<small>[ October 21, 2002, 01:23 PM: Message edited by: sdpatt ]</small>