Chasing down a cyclic vibration for years that I get between 60- 75 mph. Wheels balanced numerous times, brand new high speed balanced drive shaft etc.

Finally getting around to checking pinion angles! Please see attached pics.

First is at trans.....looks like 2º





Next is taken at rear... looks like 4.5º



My question is....what do I need to do to get an optimal reading? Is this an optimal reading? I was proactive & ordered up some 2.5º shims from Rick E. on eBay. Will these help?

Thanks in advance!