Limited Slip Differential
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See also: Differential
Differentials are used on all modern cars and trucks, including AWD and 4WD vehicles. Differentials serve the purpose of enabling the wheels of a vehicle to spin at speeds conducive to turning and changing directions. This usually requires that the wheels on the outside of a turn must spin at a faster speed and travel a further distance to keep up with the inner wheels and to accomplish the turn successfully. The differential is a device consisting of grinding meshes that enable this. It also provides torque or power from the engine to the wheels.
With limited slip differential, also known as positraction, the wheels are not in risk of being reduced to zero torque when one wheel leaves the ground. While it is similar to the open differential in many respects, it is made distinct with a spring pack, a function that grinds the gears against clutches and keeps the wheels turning at similar speeds. The clutches act to ensure that the speed of the wheels remain the same in the odd circumstance that they are not. In situations that cause a wheel to leave the ground or encounter slippage, the limited differential will provide torque for the wheel that is not experiencing this. The vehicle may not move as smoothly or as quickly as it normally would, but motion will still occur.