page_title: Locking differential
section_title: Selectable lockers MRT
hierarchical_section_title: Locking differential / Types / Selectable lockers MRT
caption_attribution_description: English: 2011 Dodge Power Wagon
context_page_description: A locking differential is designed to overcome the chief limitation of a standard open differential by essentially "locking" both wheels on an axle together as if on a common shaft. This forces both wheels to turn in unison, regardless of the traction available to either wheel individually.
  When the differential is unlocked, it allows each wheel to rotate at different speeds, thus avoiding tire scuffing. An open differential always provides the same torque to each of the two wheels, on that axle. So although the wheels can rotate at different speeds, they apply the same rotational force, even if one is entirely stationary, and the other spinning.
  By contrast, a locked differential forces both left and right wheels on the same axle to rotate at the same speed under nearly all circumstances, without regard to tractional differences seen at either wheel. Therefore, each wheel can apply as much rotational force as the traction under it will allow, and the torques on each side-shaft will be unequal. Exceptions apply to automatic lockers, discussed below.
context_section_description: Selectable lockers allow the driver to lock and unlock the differential at will from the driver's seat. This can be accomplished 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 well.  Nissan Corporation's electric locker can be found as optional equipment on the Frontier (Navara) and Xterra.  Ford offers an electronic rear locker on the F-series and Ranger trucks.  Toyota currently offers a rear e-locker on the Tacoma and 4Runner (TRD Off-Road and TRD Pro trims only), but has also offered front and rear e-lockers on vehicles such as the Land Cruiser in the past.
  Pros: Allows the differential to perform as an "open" differential for improved driveability, maneuverability, provides full locking capability when it is desirable or needed
  Cons: Mechanically complex with more parts to fail.  Some lockers require vehicle to stop for engagement.  Needs human interaction and forward-thinking regarding upcoming terrain.  Unskilled drivers often put massive stress on driveline components when leaving the differential in locked operation on terrain not requiring a locker.
caption: Dodge Power Wagons feature front and rear selectable locking differentials
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