2010 SCAB 6.2... sound at first made me think rotors/calipers rubbing, but brake application doesn't take away the noise. Occurs after letting off throttle and coasting, happens at all speeds. Sounds like poorly lubricated metal on metal. Read a lot about transfer case issues but I'm rarely ever in 4 wheel drive. Also read about a driveshaft recall I'm sure the truck hasn't had. I'm at 85,000 miles, any ideas or people with similar noise? It's definitely a new sound and not normal.