Everything was running good, 4 wheel drive was working great. Got home, pulled the truck into the garage and parked it. Went out about 12 hours later, still in 4×4 and I could hear a noise what seems to be coming from Passenger side area. I drove this way for a few blocks and would not go away, so I kicked it out of 4×4 (manual) and sound went away. 4×4 works well, just this loud noise coming from it when engaged. Any idea what this noise could be. It also gets worse the faster I am traveling.