When i was driving to work this morning there was a weird noise coming from the front part of the truck. the best way to describe the noise is if you were to stick something in a fan that had metal blades as it gives that repitive sound of the fan blade hitting whatever it is stuck in there. it sounds like it is metal on metal. It happens while the car is in motion either forward or backward, doesnt do it at idle and for the most part stays pretty much the same loudness even when accelerating. i looked under the car and nothing is dragging and didnt see anything unusual in the engine compartment or around the wheels. I get off late tonight so it will be to dark to look tonight but i am going to crawl underneath tomorrow and see if i can tell something. Any thoughts on what this could be? Thanks