I have a 2004 Jeep Liberty with 75k miles. Have a sound coming from the rear, maybe transfer case, that sounds like metal lightly scraping. This sound comes and goes. It even happens when idling at a stop light. Happens in 2WD and 4WD. I shifted the transfer case into neutral, then back into 2WD, and it seemed to go away but then came back 10 minutes later. Don't know if that was a coincidence. Anybody have any ideas?