Hi everyone, well, I went by the shop to get the alignment checked and wound up putting the 66 on the rack with the motor running and guy to accelerate for us. Instantly could see the drive shaft had a bad wobble. The head honcho says you need to have the drive shaft balanced. I say, are you sure it's not a bad u-joint? He said he checked and was okay, I said lets look again. Well, lo and behold what was not there a moment ago, was suddenly the problem! Rear joint was bad. Must have gone bad in the year it sat while I restored! Anyway, I take it home and back on the ramps and do the colonoscopy...errr-uhhh I mean u-joint replacement on both ends :: Finaly synopsis: still have a small vibration in the seat. One thing I noticed, the pinion yoke where the driveshaft attaches at the u-joint, has quite a bit of in-out motion. I am wondering if I can crank down on the nut and take the slack out of it. I have done this with a cheby before and worked great...just wondering. Thanks.