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Forgot to metion, AWD usually is permanently engaged in AWD mode OR switches between RWD/FWD(depends on design) and AWD automatically w/out driver's input....
4WD usually needs driver's input when changing from 2-wheel-drive to 4-wheel-drive(though there are exceptional, e.g. Jeep Grand Cherokee's Quottra-Drive), but ALL 4WD has driver-select Low-Range, which locks front/center/rear differentials(If applicable).....
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