Squeaking noise backing up...please help!!

01XterraPhilly

First Fill-Up (of many)
Location
Conshohocken, PA
Ok so Monday I noticed that I have this squeaking noise when I back up. Its a High low high low high low squeaking noise. It only does it in reverse gear, either off the gas pedal (coasting) or on it (speeding up). It will not do it in reverse, rolling down hill. So today I jacked up the truck, put it on stands and threw it in reverse. Did NOT hear the freaking squeak!!! It was only until I rode the brakes that it squeaked. I coasted, sped up, slowed down...didnt squeak at all until i rode the brakes. I climbed under, the noise was not coming from my drive shaft or U-Joints (they weren't wet from grease or anything). So i determined that it had to be the brakes. So after all that, I put it back on the ground and put it in reverse....again, it freaking squeaked! Even if i wasnt on the brakes; it changed in high to low squeaking with the speed of the wheel. Im completely baffled by this since it doesnt do it with off the ground and does it freely on the ground. Also, it doesnt do it going forward on or off ground. Anyone ever hear of this happening?

To recap:

Annoying squeak on the ground in reverse...no annoying squeak off the ground in reverse.
Frequency of high to low squeak in accordance with tire speed.
Does not squeak in drive or in neutral rolling backwards
 
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