ill try your method Woody hopefully tomorrow when I have time. With the driveshaft held in place and if I turn the wheels should there be any free ply at all? Or should it be lock tight? I suppose doing this will rule out the differential as the culprit.

Ans as to the motor mounts. If you can help me understand why would they cause the problem if bad. Only asking because changing them is a HUGE PITA...

i have replaced the drivers side side motor mount, a common failure when you increase the HP on these things, and I used Woodys method of cable if the engine down to the frame around the motor mount.

But it if need be I’ll replace the passengers side if I must.

Thanks again for the replies guys!
-Darren