lockers, use the stock differential carrier and replace only the internal spider gears and shafts with interlocking plates. Both types of automatic lockers will allow for a degree of differential wheel speed while turning corners in conditions of equal traction, but will otherwise lock both axle shafts together when traction conditions demand it. Pros: Automatic action, no stopping for engagement or disengagement is necessary when road conditions change. Cons: Increased tire wear and noticeable impact on driving behaviour. During cornering, which half-axle is uncoupled is dependent on torque direction applied by the driveline. When the torque direction is reversed, the speed of the driveline is suddenly forced to change from the inner to the outer axle, accompanied by tire chirping and a strong jerk. During cornering, the automatic locker is characterized by heavy understeer which transitions instantly to power oversteer when traction is exceeded. Some other automatic lockers operate as an open differential until wheel slip is encountered and then they lock up. These types generally use an internal governor to monitor vehicle speed and wheel slip. An example of this is the Eaton automatic locking differential (ALD), or Eaton automatic differential lock (ADL), developed by the Eaton Corporation and introduced in 1973 for GM's Rounded-Line C/K Series pickups and utilities. The Eaton ADL is sometimes incorrectly called the Gov-Lok, despite neither GM nor Eaton ever calling it by that name. Gov-Lok is rather an unofficial name of unknown origin that gained popularity over the years. Both Eaton and GM do not know where the name came from, and Eaton has made several unsuccessful attempts in the past to debunk the Gov-Lok name. An updated version of the old Eaton ADL design is still available from Eaton, now known as the Eaton mLocker mechanical differential lock. Some other automatic lockers operate as an open differential until high torque is applied, at which point they lock up. This style generally uses internal gears systems with very high friction. An example of this is the ZF sliding pins and cams type available for use in early Volkswagens. Selectable lockers MRT Selectable lockers allow the driver to lock and unlock the differential at will from the driver's seat. This can be accomplished in many ways. Compressed air (pneumatics). Cable-operated mechanism as is employed on the "Ox Locker". Electronic solenoids and (electromagnetics) like Eaton's "ELocker". However, OEMs are beginning to offer electronic lockers as