how many miles on the truck, and did you put the truck on jackstands and check to make sure everything is tight? lug nuts included in that statement, anything loose can cause a vibration, the other possibility is, if you feel it when you are on the brakes (lightly or hard) you could have warped the rotors

 

Rotate and balance the tires!

 

wouldnt that be a relatively constant vibration tho hydra? i know when my dads truck had a tire slip a band it was a constant shimmy/vibration and it was a fight to keep the wheel straight

 

Just an idea but yes it would be more constant, however I have had it really shake at different speeds.


Also you could check the CV half shaft.