Driveline vibration out of now where! Help!

So just to be on the same page.
Car drove fine.
You replaced many parts of the front suspension.
now you have vibration.
yes, at least i dont remember it vibrating like that. Its definately in the rear though, i jacked it up and ran it and it did it, even without the tires on it. I didnt touch anything in the back when doing the front suspension rebuild unless jacking the car up did something to it..?