Squeal On turn

[jsbihn]

Hey all,
I am trying to find out what could be the cause of this squeal I have when it comes to turning my Hummer.
For a while now I have this full turn lock squeal that comes from my rig. It used to be only when I turned right, but it seems to be progressing into left turn too.
I dont get any wiggle in the wheel, there is no sudden tightness, or any other thing that could be showing other than the squeal.
Usually once the turn is done, the squeal goes away.
Also usually seems to happen when I am moving, and not so much with the wheels turned and I am stopped waiting.

Any ideas?