Awesome.  Fixing a shake is one of the most satisfactory things you can do with an old car.  It transforms the way that it drives and how much you want to drive it.  Congratulations.....finding and fixing a shake can be a major pain.

hmartin025 wrote:

Billy C, did you add shims and repair center bolt problem at same time? Cant understand how centering bolts could help "High speed shake" problem. Under normal conditions tight Ubolts would keep axle stable. Now, not saying you dont need spring centerbolts in their holes. Just curious how that made a huge difference.
Howard

 
I did do both at the same time so I don't know for sure which one was causing the problem or if it was a combination of both. I would think that if for what ever reason the axle shifted it could cause some kind of misalignment with the drive line. Not speaking from experience here just and educated guess. Anyway the shake is gone and some of the undesirable handling quirks are gone.

There's not much stock on this buggy. 66 coupe 289 t5 trans, dropped ucas, 1"lowered rear. Pinion angle was off by about 2.5 degrees. I shimed it 2degrees and that took care of it.

Vibration can be a booger to troubleshoot and repair. I suspect the tapered shim helped mostly.
Great thing is the vib is gone!!! Hopefully never to return.....
Howard