Sit back and watch this 45 minute documentary on 4 wheel driving, a good watch!!!
Taken from the videos description:
Four-wheel drive, 4×4 ("four by four"), 4WD, and AWD is a form of drivetrain most commonly capable of providing power to all wheel ends of a two-axled vehicle simultaneously. It may be full-time or on-demand, and may be linked via a transfer case to provide multiple gear ranges.
A four-wheeled vehicle with power supplied to both axles may be described as "all-wheel drive". However, not all "four-wheel drive" vehicles are "all-wheel drive", as vehicles with more than two axles may also be described as "four-wheel drive" regardless of how many axles, so long as two axles (of two wheel ends apiece) are powered.
Read More: https://en.wikipedia.org/wiki/Four-wh...
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