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High/Low Range To enable a 4WD to travel at lower speeds while traveling on rough terrain it needs lower gear ratios. Not all 4WD's have low range gearing and this restricts their ability to tackle rough terrain. However 4WD's that lack low range gearing are generally not built for severe off-road conditions or sometimes have a "crawler" 1st gear to compensate for the lack of low range gearing. The high range ratios in 4WD mode are the same as the gear ratios in 2WD. When low range 4WD is selected, the gear ratios are approximately half that of high range, although the exact ratio varies for each vehicle manufacturer. For example this means that if an engine speed of 3000 rpm in high range fourth gear is 65 mph, then in low range at the same engine speed and the same gear, the speed would be around 30 mph. Some points to note about low range gearing are: * You cannot select low range in 2WD mode in most cases. * You do not have to use low range as soon as you put the vehicle in 4WD, but only if the terrain requires it. * On most vehicles you have to be stationary when changing from high to low range, check your owners manual for your particular vehicle.

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