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4wd is for low traction conditions ONLY!!! you will destroy your transfer case if you drive around on dry paved roads in 4wd unless your car/truck is full time 4wd or awd. If your vehicle has seperate 4wd ranges (4H and 4L) these are for high and low range, low range would be used for applications where lots of torque and not much speed are required (pulling people out that are stuck, rock crawling etc.) where high range would be for slick roads, mud, and situations like that. 2wd will give you better fuel economy by a small amount.
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