Thanks, Larry. Yes, I saw your earlier post on that.
Thinking more about the effect of moving the carrier bearing slightly,
this would either increase or decrease the rotational movement of the
u-joint spider minutely. Initially i couldn't justify to myself how this
small change in the rotation could effect vibration of the shaft.
However, maybe what is really happening is the harmonics of the whole shaft assembly are affected by moving the bearing slightly, and the orbital wobble is reduced??????

Hey, whatever. It's gotta be worth a try. Not so easy for me to do, I may have to pull the exhaust and the big shield on my car, but i'll give it a try soon.

Thasnks again,
DG