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>To counteract this, the better AWD cars are fitted with a center differential that contains a clutch or viscous drive unit. This splits torque front-to-rear, directing it away from the spinning wheel.

The differential contains a nifty little clutch. When the vehicle detects no traction, it engages and sends the torque to the correct location. Otherwise you'd end up in a situation similar to engaged cruise control with no traction. Limited slip differentials and locked differentials cause much confusion.



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