I was wondering if anyone new what could be cuase vibration at high speeds around 80mph. I just got a new torque converter, transmission mounts and a new drive shaft and i still am having a problem but it is not as bad at all form before. anyone have any suggestions of what it could be it is driving me in sain.
Are all your control arm bushings good along with all other front end parts. Also what kind of wheels do you have? I used to have aluminum slots and they were balanced but the weights were stick on and were a nightmare. I switched to styled steel wheels and solved my problems.
I did have a severe vibration about 15 years ago and it turned out the flywheel I got from a swap meet was for a 240 6 cyl same dimensions but different balance. I knew it was a rotating part on the engine and changed water pump alternator ps pump and even the cam, then it hit me to get the number off the flywheel and bingo bought a hays and vibration gone. Also the lighter flywheel lets me use an 11" clutch and revs quicker.
First of all make sure your new driveshaft is properly mounted, especially that the rear u-joint is fully seated in the pinion yoke and if new u-joints have been mounted check to see if these are seated properly. The front yoke should have about 1" clearance in to the transmission before it bottoms out. Drive the car, when the vibration occurs put the transmission in neutral and let the engine idle, if it still vibrates(high frequency) it comes from the driveshaft assy.
Posts: 2
Joined: 1/23/2004 From: United States Status: offline
Wheel balance problems always seem to show up around 60 mph, Incorrect flywheel balance usually at 1K to1.2K RPM,so I would look at driveshaft balance and/or pinion angle. It seems the latter is almost always overlooked.
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vibration problem help - 
