Four-Wheel Drive

A four-wheel drive, also called 4×4 ("four-by-four") or 4WD, is a two-axled vehicle drivetrain capable of providing torque to all of its wheels simultaneously. It may be full-time or on-demand, and is typically linked via a transfer case providing an additional output drive shaft and, in many instances, additional gear ranges.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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