1997 Gmc Yukon "sqeek"

Hi! When I am reversing in my YUKON I hear a squeeking sound, I hear nothing when I'm going forwward. Any help please..........

Where is it coming from? What does the squeek sound like? You will have to help a little more than that for us to diagnose your problem. Is it just when you put it in reverse or just when it is moving backwards? Help us help you, be a little more specific as to your problem