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2. Locking differential - Wikipedia

   en.wikipedia.org/wiki/Locking_differential

   Differential locking can also be used in the sport of drifting as an alternative to a limited-slip differential. Four-wheel drive vehicles that drive off-road often use a locking differential to keep from getting stuck when driving on loose, muddy, or rocky terrain. Locking differentials are considered essential equipment for serious off-road ...

3. ControlTrac - Wikipedia

   en.wikipedia.org/wiki/ControlTrac

   ControlTrac II was a Ford four-wheel drive system based on a viscous coupling unit. The viscous coupling replaced the typical center differential used in four-wheel drive applications. The system worked normally in front wheel drive but in addition to the front wheels being driven, a shaft is powered that runs to the viscous coupling in the rear.

4. Locking hubs - Wikipedia

   en.wikipedia.org/wiki/Locking_hubs

   Locking hubs, also known as free wheeling hubs are fitted to some (mainly older) four-wheel drive vehicles, allowing the front wheels to rotate freely when disconnected (unlocked) from the front axle. This is done to reduce the mechanical resistance of the front-portion of the drivetrain when four-wheel drive is not in use. [1]

5. Jeep four-wheel-drive systems - Wikipedia

   en.wikipedia.org/wiki/Jeep_four-wheel-drive_systems

   Active Drive Lock includes all the features of Active Drive II but adds "rock" mode to the Selec-terrain system and locking rear differential for better traction when used off-road. This four-wheel drive system combined with tow hooks, skid plates, and unique front and rear fascias allows the Jeep Cherokee Trailhawk models to obtain the "Trail ...

6. Differential (mechanical device) - Wikipedia

   en.wikipedia.org/wiki/Differential_(mechanical...

   Locking differentials have the ability 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 (or lack thereof) available to either wheel individually.

7. 4Matic - Wikipedia

   en.wikipedia.org/wiki/4Matic

   The first generation 4Matic system was originally a complex electronically controlled system with automatically engaging four-wheel drive (4WD), the system employing locking central and rear differentials to provide additional traction in slippery conditions. The centre differential, also known as the transfer case, contains two clutches.