This effectively doubles the number of gears (12 forward and 4 reverse gears). The G-layout has an additional reduction gearbox, which can be used in all gears. An additional shift lever is used for shifting into reverse. To operate the gearbox, there is only one shift lever with a 6-speed H-layout, the gearbox shifts its ranges automatically. Due to the lacking shifting sleeves however, the reverse direction can only be used in the first range, which itself is limited to the first two gears, resulting in only two reverse gears (resulting in 6 forward and 2 reverse gears).
Instead of a reverse gear, the gearbox has its direction gear, which, in therory, can be used to reverse any gear. The F-layout is the original gearbox layout and is limited to the first two gears in the first range as it does not have selector sleeves, meaning that in total there are six forward gears. There are different layouts of the gearbox, namely F-layout and G-layout as well as their upgraded layouts, not having particular names.
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