High Range is 3rd gear. Low range will reach speeds of 38 mph or more. Your UTV has a Rev Limit of 8,000 rpm and it will not let you blow it up. If you drive 20 mph or less, you must stay in Low. 20 mph or more, High range is fine. You can not shift on the fly ! If you come off a trail to a roadway, stop, shift to High and accelerate up to speed. Just don’t go slow in 3rd gear, High range, or you will burn up your clutch system. Driving slow in 3rd gear is hard on any machine.