Re: Vibration @ 50mph and on.
Heres some stuff I found for you, I just copied the whole thing
My chevelle is a 19000 mile car but it sat from 1978 to 2004 The car is fine below 50mph but vibrates badly from 50 on.... I am going to replace the U-joints since it is a 4 speed car. Could it possibly have a bad tail bushing also? The vibration is worse off power but does vibrate on power as well. Only abouve 50 mph though.
Have the driveshaft checked for straightness and have it ballanced too and you will hopefully correct the vibration.
If it still vibrates after that check the trany yoke and tail hosuing bushing and replace them if they are worn/sloppy.
Hows the pinion bearing?
Just a thought,does it vibrate with car stopped in neutral when you rev the motor (with the clutch out/engauged) to the same rpms as when your running down the road and its vibrating?
If yes then its an out of ballance rotating assembly in the motor,or a bad harmonic ballencer,out of ballance clutch assembly & flywheel,etc.
The car is very smooth until 50 mph no engine vibe or tire wobble. pinion bearing seems tight. I guess I'll know more after the u-joint replacement
Check for a bent wheel or tire with a broken cord. Cords will sometimes cause a bulge and sometimes not. Good luck.
U-joint- A friend of mine bought a clone '69 Trans Am, that had sat for 8+ years, and had a major vibration. Both U-joints had seized up , and as he approached 45mph, it started vibrating. Anything above 65mph, and it was all he coud do to hold it in the road. He changed them out, and the problem went away.
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