...louder the noise? So I drive a 2005 Ford F-150 and I just drove about 1000 miles from Texas to Colorado. The whole drive I didn't hear anything and the car drove fine. I parked for a few hours when I got to Colorado and now when I drive there is a high pitched noise that sounds like its coming from the driver's side front wheel area. I got underneath and check to see if there was anything stuck and couldn't find anything. It's not related to the RPM, only my road speed. Like when I put it in neutral and rev the engine you can't hear anything but when I started rolling down a hill the noise will get louder and higher pitched the faster I go. It might be a belt but I'm not sure. If you ask me some more questions I'll try to answer them under additional details... Does anybody have any suggestions on what it might be or what else I should check out before I take it to a mechanic? Thanks for any help!!!