I just bought my 2006 F150 Fx4 4X4 5.4 on saturday.
Everything seems to run great but this ANNOYING / LOUD squeak that is only when I accelerate and only at less that quarter throttle or so. If I step on it, it doesnt do it, if i am coasting or stopping it doesnt do it. ONLY when I am cruising along at a steady speed. Squeak is coming from front end/ driver side
PLEASE HELP I CANT STAND IT

 

Tight U-Joint? Remove the shaft and see if a joint has a tight spot. Hung up brake pad?

 

Maybe bearing in a pulley are starting to go bad?

 

So, I am not extremely mechanically inclined. What is this going to cost me?
Thanks for the replys by the way

 

Oh and I just got an alignment at les schwab they said the brakes look great they said they are damn near 100%

 

Did you ever determine the cause? Mine just started doing this and it vibrates starting at 55 mph. Driveshaft? Rear brakes?

 

Try posting a video so we can help you out.