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AWD vs 4WD: What's the difference and which one do you need?

Although they may sound similar, AWD and 4WD are built for very different driving conditions—here's how they actually work ...
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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.