FOUR-WHEEL DRIVE

(4WD) A type of drive system in which both front wheels are connected to its own differential and axles, and both back wheels are connected to its own differential and axles. Between these two differentials there is a transfer case which allows you, in the case of part-time four wheel drive, to switch between two-wheel drive and four-wheel drive. In full-time four-wheel drive power is sent to both differentials .