Need Advice, Suggestions

johnmucci said

Ok, we raised the rear and put it on jackstands..started the car..in park and no vibration, neutral no vibration, put it in drive and vibration city.... shut it off....disconnected the drive shaft...started car in park no vibration, neutral no vibration, 1st 2nd and drive...No vibration....So whatcha think????

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You had the vibrations on the jack stands and that's not torque loading anything, Yea you can get interference with exhaust, but i really think it's the shaft or behind it. Maybe all that new power is taking out the pinion bearing:D. Seriously i have to wonder about the balance job. When and if you reinstalled the shaft, was it any different from before?