Quote:
Originally Posted by Rich Biebel
"sent shaft out to a Fleet Pride to get inspected (said it had a slight bow/straightened/rebalanced), "
This right here gets my attention...
said it had a slight bow......and they straightened it and rebalanced it....
A driveshaft loves to get into a harmonic vibration so I would try another shaft......just to eliminate that possibility.
We had a brand new F-450 service truck that had a ridiculous vibration starting from a dead stop. It went back to the dealer and they shimmed the rear's pinion angle.......It did lesson the vibration but did not eliminate it.....I think they tried numerous other things before the pinion angle change....
Driveshaft is where I think your issue is......just from past experiences....
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I agree , I'd try another driveshaft....carbon fiber if you know someone.......?