Ran her up to 75 with just a mild vibration!!!!!!
I centered the rear wheels in the well. Front to back. Just loosened the u bolts and adjusted the traction bar to get it eyeball close. It will need a proper alignment but that will happen sometime over the winter/early spring.
Then I had the tires road force balanced at Discount Tire today. They are the only place I could find near me who does it. Tire discounters, Bob Summeral and the local shop have balanced them previously on a regular balancer. None made much of a difference in the vibrations. Replacing the rear wheels and tires didn't help. Therefore tires were ruled out as the problem. Discount Tire did not find excessive run-out or any bent wheels. All were out of balance though. One was 2 oz out and the rest were under 1.5 each.
It is not stable at 65+mph as the caster and toe are off as well as the thrust angle now. But !!!!! It is a lot smoother. I still have a mild driveline vibration at 60+ but it's not enough to think its about to self destruct. My better half commented how we can actually have a conversation now that it's so much smoother.
It still has the 2 degree shims in place. The tires and axle adjustment made such a difference I am going to remove them and see what it feels like.
Basically wasted a year chasing my tail. Replacing parts and being frustrated. Just needed the most basic of steps done competently. I probably changed the thrust angle when I replaced the traction bars. A performance shop touched her next and set the thrust angle wrong. He even told me how easy it was to set using the traction bars. Then Bob Summeral didn't catch it when they re aligned it. I should have caught it myself as well.
The best part is now I am able to move on to the pretty stuff! Carpet will be here in a week or so. Maybe I can get new seats and a stereo before summer!