I have a 1999 GMC sierra z71 with 142000 miles, its the new body style with the 5.3. Lately it has started making a high pitch squeaking or chirping noise that seems to be coming from the center or rear of the truck. It happens anywhere from 5mph to 25mph then goes away. It only does it in drive and not in reverse and i'm pretty sure it isn't my brakes as I just had them replaced. I don't believe its metal on metal as this sound is too squeaking like rubber... Anything to as what is making this noise would be very helpful.