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The function of the gearbox are as following:
1. Change the transmission ratio, expand the range of torque and speed of the drive wheel to adapt to the changing driving conditions, and at the same time make the engine work under favorable conditions (higher power and lower fuel consumption);
2. With the same direction of rotation of the engine, the car can run backwards;
3. Utilize neutral gear to interrupt power transmission so that the engine can start, shift gears, and shift gears or power output. Reaper binder gearbox is one of the nice one.