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Several manufacturers offer selectable locking rear differentials as part of their off-road option packages. Electronic lockers are designed to allow for 100 percent of the available torque (sent from the engine through the driveshaft) to distribute all available traction between the two tires.
Tech: Truck Traction

 Several manufacturers offer selectable locking rear differentials as part of their off-road option packages. Electronic lockers are designed to allow for 100 percent of the available torque (sent from the engine through the driveshaft) to distribute all available traction between the two tires.   Related Article