• Some 4WD vehicle manufacturers offer a "limited slip differential" option. As the name implies, they limit wheel slip. These use clutch plates to lock the differential, and when turning on dry pavement they just slip.

• Unfortunately, they also slip when there is a significant difference in traction between two wheels in an off-highway situation. Limited slip differentials do not prevent wheel slip; they only delay wheel slip. Therefore, traction is lost a little later than without limited slip, and you will be stuck a little later.

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