When I got mine it would always make a "whine" when decelerating under 40mph or so, almost like it was in low-gear and right before I would get to a stop it would just disappear, almost like something disconnected at a certain speed, would happen when you felt the transmission downshift before a complete stop. Since I put my manual hubs on I don't hear it anymore so I'm thinking it had something to do with the TOD and front axle.