What's the difference between 4WD and AWD? Definitions vary, but 4WD has a special low range to help the vehicle in off-road conditions. Usually it's called 4L (4 Low). Under normal conditions, the vehicle is usually is in two-wheel-drive mode and goes into 4WD when the driver throws a switch. Most real trucks use this type of 4WD.
AWD systems have no such extra low range. They may be either full time, meaning the power is sent to all four wheels all of the time, or part time, also called on-demand, in which the power kicks into the other wheels when slippage is detected in the primary drive.
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