I am hearing a metal on metal sound like when brake pads are worn down completely and the metal backing is rubbing the rotor. I have checked the brake pads and they are fine (recently replaced). I checked for play in the wheel bearing assembly but it feels fine. If I jack up the truck and roll the wheels by hand I don't hear the sound at all. The sound is consistent at all speeds. Could it be the transfer case? What can I do to figure out what is making this sound? The Truck is a 97 EB 4wd.