[frankym]

Ok problem has been solved.

I spoke with Dennis Olthoff and he said that the rapid vibration that I was experiencing in a full bump steer, was likely attributable to the axles making contact with the inner CV housings under full throttle out of the turns. Sure enough, when I removed the axles, there were signs that the housing was being bumped by the axles. Dennis recommended milling the inner CV joint housings by 1/4 inch. I took the axles out and brought them to a machine shop and am awaiting their return and will try to reinstall them this weekend with some help. You can see on the housings there are 3 bulbs that contain the roller bearings and there are abrasions where the parts are coming into contact under normal track conditions. For many SPF owners that don't bring their cars to the track, they may never experience the limitation, but it's very easy to do on a track with some spirited throttling out of the turns. I am not sure if SPF has recognized this as a problem or if other car owners have experienced this condition. Since the Olthoffs have extensive track and race experience, they were familiar with the condition and diagnosed itimmediately. If it's a compatability issue with the thuderbird rear and the SPF rear suspension arms and camber, hopefully the current cars have been modified for this issue.