I'm using a rod to listen and it sounds like my t case maybe growling while driving. its a marlin tcase with 4.7 gears. there are no metal shavings in the oil and all of this happened after i pulled my buddy out in reverse. Does anyone have any ideas as to what it can be? My carrier bushing was replaced after i did the pulling which was a slow pull and not a jerk. Any info would be very helpful.