Squeek in reverse

Only when the jeep is cold, when i reverse i get a "squeek...squeek...squeek" noise. Once i start going forward it stops.....

could this be my u-joints??

Yeah im pretty sure it is. Mine does the exact same thing, but in my case it does it in forward as well. More than likely its your u joints in your front driveshaft. but heres a thought. I was gonna change em out last weekend so sprayed em with pb blaster to loosen the bolts and... they stopped squeaking.... or at least now there are quiet enough to where i cant hear them unless i roll down my window and stick my head out the window and its still faint. not a sollution but it worked ok for me. stilll gonna replace em though