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Gearboxes are used in F1 cars in accordance with FIA specifications. Any device which can transfer torque from a slower to a faster rotating wheel is not allowed.

Gearbox

Gearboxes are the parts in car mechanism which transfer torque from the engine crankshaft to the drive shafts. All gearbox components in Formula 1 cars whose objective is for the transmission of power or mechanical selection of gears, bearings associated with these components and the casing in which they are housed are all included in the system.

Parts of Gearbox System
These parts are not part of the gearbox system and can be changed. However, if an FIA applied seal can be broken in this process, it must be done under FIA supervision. The parts include the clutch assembly and any shaft connecting the clutch to the crankshaft or first motion shaft of the gearbox, the clutch actuator and clutch release bearings, inboard driveshaft joints and seals, electrical sensors, actuators, servo valves, oil, oil pumps, oil filters, oil seals, oil coolers and parts associated with functioning of the sprung suspension attached to the gearbox casing.

Gear Ratios
F1 regulations specify that no forward gear ratio pair may be less than 12mm wide when measured across the gear tooth. Each side of the gear teeth could be chamfered by a maximum of 10°. Excluding any integral shaft or collar the gear ratio pair should be less than 600g in weight. The gear ratios must be made of steel. Rules disallow continuously variable transmission systems to transfer the power of the engine.

Transferring Torque
As for the torque transfer systems, any system or device which can transfer or divert torque from a slower to a faster rotating wheel is disallowed. Devices capable of transferring torque between the principal axes of rotation of the two front wheels are also not permitted.