Ive got a vibration in the driveline at speeds above 65mph. ive had the draftshaft straightened,u-joints replaced,and the input shaft bushing replaced and the rear end checked out. 90% of the problem is fixed but it is still annoying. what else could be the problem? wheels are OK. could a warped frame be the problem?

I would suggest chocking the front wheels, then jack-up and place stands underneath the rear axle and support car.

Then, start engine, place trans in high gear, and check straightness(or lack of) of the rotating driveline.

I found a bent U-joint this way after checking by conventional methods.

Driveshaft should rotate smooth, might even remove wheels and see if vibration is gone, Substitute a driveshaft, wheels, brake drums(?), etc. Could be an out-of-balance clutch and/or clutch cover or missing clutch material on plate. Does it happen with engine RPM in any gear or with speed of car only?

I don't think it could be a bent/warped frame, but then I'm not a body/frame man, either.

Everett 68/350/PG/11.90/115mph

Does it do it in high RPM in low gears?

I had the same problem and my fly wheel was off balance.

Tony

it dosent do it in low gears high rpm. only above 65 mph.

It sounds speed related, not RPM related... Could be several things from out of balance wheels to a bad trans mount...

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