I have a 2003 Sierra Z71 and for about a week it have been hearing a high pitched noise coming from somewhere in the front of the truck. I cant tell exactly where because it only starts when I get over about 10-15mph. It doesnt get louder when i'm going faster or change if i'm accelerating or braking. I know this may be hard to answer, but any similar experiences or ideas would be great. Thanks

Maybe the air conditioner going out.

look at the dust shelds behing the brake rotors, maybe there is a rock lodged in there somewhere. are your brake pads worn, if so maybe the little tab on the pads are rubbing the rotors, just a thought.

does it change tone when you turn the steering wheel?

Belt tensioner pulley?

The brakes seem fine and it happens when the a/c is off also. The noise doesn't change when I turn. Once I get upto about 12mph it starts and doesn't change till I'm going slower than about 12mph. It almost sounds like metal rubbing together making the high pitched noise. I wish it was simple but I think i'm going to take it somewhere monday. I've heard of people with four wheel drive having kind of similar problems/noises when it's going out.

Possible front u-joints.

thats y i said check the backing plate behind the rotors. down by the lower ball joints it can get bent and rub the rotor, not saying thats what it is but could be,

Could be a wheel bearing going out. Those sealed bearings are notorious for that. You have to replace the entire hub.

They usually make a roar more then a high pitched noise though.

+ 1 on the wheel bearing, had one go out on my 04, The way they have it set up sucks cause you have to buy the whole thing, bout 140. Luckily my dad had one go out before me so i just used his lifetime warranty at autozone. Call some buddies if you know anybody who replaced one i think 02 through 06 is the same part.

Thanks for the ideas, but I think i'll have to take it in eventually. I really cant tell exactly the area its coming from since it only happens while driving and it happens sometimes and other times it doesnt. I'm starting to think it sounds more like a squeek. I dont know.

Just remember, the problem will not fix itself. The longer you put off the repairs, the more wear/damage you take a chance on doing to your truck. More damage = more $$$

Yeah thats whats frustrating for me. I want to get it taken care of but I dont want to pay someone to say they didnt hear anything. I'm still going to drop it off this week I guess.

Get the advisor to ride with you & hear the noise. That way they cannot say they didn't hear it.

Front hub bearing assy. See it all the time.

sounds like the cv jont in the front drive shaft to me alot of people over look it

WTF...dont know why someone would try to sell baby strollers on here but.....

Well took the truck in today and $300. later they replaced the U joint, front brake pads and front rotors.

Maybe rosetaylor' clock is ticking.....LOL.....

Glad you got your truck fixed....