I've only had the truck now for about 2-3 weeks and we took are first long distance trip in it this past weekend to Wisconsin. Just before we left I took the truck in to have the wheels balanced and a front end alignment done as it was pulling to the right. (left front wheel was toed in and corrected)

Here's the problem....at between 60-72 the truck has what feels like a high speed up and down vibration in the left front end. if the truck is pushed past 72 it smooths out and rides fine. however in that MPH zone it gets pretty bumpy...and after 1300 miles it was really annoying! The truck currently has 53K on it, and when I head out to lunch i'll check what brand the tires are...but they have plenty of tread depth and atleast another 30K miles in them.

Any Ideas? Thanks!

 

Mine was doing the same thing. At dealer now. They say hub bearing going bad.