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The function of the gearbox is to change the gear ratio depending on speed and power requirements.
There are two main types of gearbox - Manual and Automatic.
Gear shift indicator*
The gear shift indicator notifies the driver when it is appropriate to engage the next higher or lower gear in order to obtain the lowest possible fuel consumption.
Gear selector inhibitor
There are two different types of gear selector inhibitor - mechanical and automatic.
Automatic gearbox - Geartronic*
An automatic gearbox with Geartronic differs from an automatic gearbox with Powershift, in that it has a hydraulic torque converter that transfers power from engine to gearbox. It has two different gear modes - Automatic and Manual.
Automatic gearbox - Powershift*
The Powershift automatic gearbox transmits the motive force from the engine to the drive wheels with double mechanical clutch discs, as opposed to Geartronic which instead uses a hydraulic torque converter.