1. Autos

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  Related Terms
• Four-Wheel Drive
• Front-Wheel Drive
• Rear-Wheel Drive

Definition: A vehicle (usually a car) where all four wheels are driven. Most are fulltime systems for year-round driving, and use a viscous fluid coupling center differential instead of a transfer case to route drive torque to all four wheels. This allows the front and rear wheels to turn at slightly different speeds when turning on dry pavement.

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