strange vibrations...

[SmokinChevy2000]

i've noticed when i go down the thruway that my bed starts to vibrate and i can actually see it vibrating around in my side mirrors :eek: . it only seems to occur at a certain speed around 58-60 mph. I think its the road because it happens in the same stretches all the time. Anybody else have this kinda thing goin on? maybe i need a rear end alignment... :rolleyes:

[67Truckin]

Check for tire balance and U-joints. If a u-joint is going out in the rear it will vibrate similiar to a bad tire out of balance. :)