Not Ranked
Jim brings up a good point...!
Jim's note is pretty much on target, Gary... I should have thought a little more about what you wrote, Gary...if the problem was U-joints, then it wouldn't go away when you up-shifted. The drive shaft maintains the same RPM at the same speed. Therefore, whether you're in 2nd or 3rd, if you're doing 65 MPH your driveshaft is doing so many revs independent of the transmission, flywheel, clutch, pressure plate, etc. There's a formula for calculating drive shaft revs based on your ring and pinion ratio, but I think you get the picture. Engine RPMs are independent of drive shaft RPMs due to different gear ratios, 1st thru 5th. If your vibrations go away when you shift up, then it's not U-joints or driveshaft related, I wouldn't think.
I'd agree with Jim's comments on possibly the clutch disc, pressure plate, or other rotating mass ahead of the drive shaft.
Thanks, Jim, for making us rethink this. 
__________________
Flyin_Freddie
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Last edited by Flyin_Freddie; 11-09-2001 at 10:42 AM..
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