I could not find a reference on guaging the install for engine new mounts. I ended up loosening the transmission mount and making sure it was not binding anything up, then tightened it back. I had my wheels and tires balanced again just to be sure there weren't problems there.

I did a 500 mile trip, and the car seemed to drive better, very minor vibration under acceleration. However, on the way back I had the rear loaded down with about 300lbs again. I started to notice the vibration again when the rear end sat lower. I did remove the heat shield and look at the center support bearing and the flex discs. Both look ok, but there was some up and down movement on the driveshaft if I pushed near the center support.

Any other ideas before I start replacing parts? I think the shocks need to be replaced, and I'm going to look at the springs, pads, and subframe bushings, but what other things should I look at before I start buying parts?