Thanks Gents!
The problem of the vibration is seeming to be pointing to the drive shaft. The angles I had were the engine - 3.25 deg, and now the pinon is at -5 - 6 degrees.
The out of phase yokes is encouraging. I may try that if the shop has no luck w/ balancing.
I had installed new engine mounts just 2 yrs and 15 K miles ago.
I will keep Y'all informed as it progresses.

Cheers, Bud