Vibration

My friend just bought a 95 GT. The car has a bad vibe. we replaced the flywheel and clutch and that didnt help. We also replaced the harmonic balancer. we have had the tranny out numerous times and nothing seems to help. it has a new throw out bearing and pilot bearing. we pulled the tranny once and supported the motor with a jack stand and the vibration went away. The guy he bought it from said he rebuilt the tranny so i think that might be the problem. any ideas?????
 
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