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A true four wheel drive system can be quite dangerous. By true, I mean a vehicle with a transfer case that turns th front and rear axles at the same speed. The front wheels travel farther than the rear wheels unless you only drive perfectly straight and this causes axle wind up. In deep snow and mud this isn't a factor but on wet or icy roads it is, and on dry roads it can damage the drivetrain.
Now a good all wheel drive on the other hand is safer than anything.
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