When it comes to getting awesome levels of traction for the sled pull or an off-road adventure, the stock differential may not cut it. Eaton's Detroit Locker mechanical locking differentials give your truck awesome levels of traction so that your diesel can dominate on and off road. The Detroit Lockers have a mechanical lockup when you're driving straight, but unlock when you turn your wheels, so that you get more or less normal street driving and handling. Eaton has Duramax differentials, Cummins differentials, and Powerstroke differentials so that you can give your big diesel truck of choice awesome traction and handling performance.