[Hitman]

The problem starts at about 55-65 mph. It is weird. Smooth as silk up to those speeds. It has had new wheels, tires, ujoints, centerlink, idler arm, new springs, shocks, and inner and outer tie rod ends. The only thing left are the ball joints and bushings and the rear upper and lower arms and of course rear end rebuild and driveshaft balance. I even bought a rear end and swapped axles and put in new axle bearings and wheel bearings in the front and that did not fix it. I know the toe in and toe out is off due to the front end work and I know that the wheel sits in at the top, I just figured it needed to be aligned but after reading about bushings I figure well hell, I might as well try that next.

[kustom66]

i do alignments all day at a local mom and pop shop and it sounds like either the wheels are bent or the tires are out of round or not balanced properly.
unless you have severely worn out suspension parts i would look their first.

[68FB400]

If the ball joints and control arm bushings are original and you've already replaced everything else, go ahead and replace them too. It may not be the direct cause of your problem, but they certainly are not helping.

I agree with 69lm69gp, 90% of vibration problems come from tire/wheels. If your suspension is loose you may be getting uneven wear patterns in the tires thus causing the vibrations.

When you replaced the wheels/tires, was there any improvement?