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How 4WD works - four wheel drive

How does four wheel drive work? This video explains the workings of four wheel drive (4WD), and gives a definition in order to differentiate different types of four wheel drive and all wheel drive.
The Auto Wire on MSN

AWD, 4WD, FWD, RWD: Here's what that alphabet soup on your car actually means

FWD, RWD, AWD, 4WD — they're four of the most common acronyms on a window sticker, and plenty of drivers honestly aren't sure ...