Four wheel drive is designed to be used on surfaces with reduced traction. Obviously, dry pavement does not fit this criteria. There are some full-time systems that can be engaged in 4 wheel drive all the time, but most of these systems suffer from premature wear on drive components. Unless your system was designed for full-time 4WD use, putting it into 4WD, high or low, while on dry pavement will result in the breaking of some very expensive driveline parts. Read your owner's manual to be sure. There really is no need for 4WD on a dry, hard surface.
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