Ok guys, here's an update FWIW.
Yesterday I talked to a guy at Rusty's (maybe Rusty himself?) and he said that they have not heard of any reports of a driveshaft vibe after the coil lift install. He said if I or the dealership can't pinpoint it, to give him a call back.
SO, today I stopped at the dealership for my appointment and had them check it out. I also asked while they were under it if they could remove one rear upper spring isolator from each side, since I'm running two per side with the clevis in the front. The front has settled a bit more and I wanted the KJ to sit more level.
The dealerships bright conclusion was that the vibe was caused by the lift changing the driveshaft angle. I made sure to tell them that I seem to be the only one with this lift and the driveshaft vibe. They also said that they could not remove the spring isolator on each side in the rear and that I'd have to take it to where I had the lift put on. I told them that removing one spring isolator per side would be basically returning the rear to stock as far as isolators go. They weren't budging. I think I may have to actually fill out that comment card this time!
Sooooo, I'm just a bit frustrated at this point, being the ONLY ONE with this driveshaft vibe from the Rusty's lift. I've got 245/70 and am even debating if they'll fit if I go back to stock. I really would like to keep the lift, but get rid of the vibe.
Rant over........for now!
