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????

Now the front end is out of the picture. Next while it is still on the jack stands I would put the drive shaft back in and start the car and put it in gear. Then take a tire tool or some other steel item and start touching it against the rear end to see where you can feel the vibration the most. (DO NOT GET THE TOOL ON A MOVING PART!!!) If you feel the vibration more near the wheels, take the wheels off and put the lug nuts back on to secure the drums and test again.