Gearbox
The gearbox is part of the car's powertrain (power transmission) between engine and drive wheels. The function of the gearbox is to change the gear ratio depending on speed and power requirements.
The car has a seven or eight-speed automatic gearbox. The number of gear changes means that the engine's torque and power range can be used effectively.
Two of the gears are overdrive gears that save fuel when driving at constant engine speed. The driver display shows the selected gear position.