OK I'm starting to think it's the drive line vibrating. I e-mailed the guy I bought the truck from and he said is started vibrating when he had the 4" lift and 33" tires installed. They told him it's normal for the 33" tires to cause that vibration but I have done plenty of 33" even 35" tires on small trucks at my work and most of them don't vibrate from the tires. So I think it's the driveline how can I figure this out? I'm pretty sure he had Les Schwab do the kit and I'm sure they didn't do anything with the driveline to correct the angle.

Brian