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THE twin X is a planetary underdrive like a Ruckstell as used in a T Ford. They were available with close ratio gears in direct drive, giving a closer highway ratio. They use a dog clutch, so they aren't a smooth shift. Tapping the clutch and backing off the throttle when going from low to high and tapping the clutch an giving a little more throttle when down shifting make a reasonably good shift. Shift should be a good snap of the lever from one ratio to the other. A lazy shift could cause you to be free wheeling and having to stop to get it back in gear.