Need Advice, Suggestions

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????
Definitely sounds like a driveshaft or even a Rear end problem. Rule out U-Joints first. I've seen them so tight that they wouldn't "swivel".