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You basically have two types (excluding trucks.) One that is four wheel drive all of the time, using a center differential to split the power and the other is two wheel drive normally, with a clutch that locks up to send drive to the rear, if the front tires slip. You want the first version, as the second one isn't transparent when it works. You can get seriously out of shape before it engages the rear wheels.
Manual locking differentials (as in the first Audi quattros) have essentially gone away in favor of Torsen diffs and things like that.
JR
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