[Warpath]

I know your getting alot thrown at you, but I also had a vibration that began at 55 mph. Very annoying! I was in a rush to cure this since it was going to Show Hauler for the Conversion. Since it had not been stretched I leaned towards a wheel/tire problem.

I went with all new Aluminum rims front/back and new front tires. The guys at the tire shop thought it was a slightly bent rim,(no broken belts in the tires) and said most truckers wouldn't have given it a second thought.

That fixed it. You would have thought I could determine if it was front/back related or wheel/drive-line but I could not pin point it. Although there was no fluctuation in vibration when I was on or off the throttle so I pretty much put the tranny/motor on the bottom of the list.

Let us know if you get it figured out, when you do your going to love that thing again, I know I did.