every once in a while a sound will come from the transfer case. it makes the sound when the car begings to roll. it also happens when you put the car in nutral and the transfer case in nutral and rev the motor. i think it is towads the back of the transfer case becase i looked at it and everything it the front looked normal. there were no metal shavings or anything like that. if yuo have any ideas on what it could be please let me know. thanks