Driveline Vibration

hmmm...i checke dmy pinion angle too, and had the tires balanced...and the driveshaft is a new one from whoever supplies Mancini. Mine is a slow vibration, at 45-55, and then it is like a super high frequency from there on up, but mine doesn't do it all the time.
if you make a sound like a bee, that is like the vibration i get at 55+