Vehicles with inside combustion engines, contrary to electric autos, require the engine to operate in the slender number of fees of rotation, requiring a gearbox, operated manually or automatically, to drive the wheels above an array of speeds. Twin-clutch automatic gearboxes started to seem in road autos in 2003, notably https://gearbox-auto20741.livebloggs.com/40179442/the-ultimate-guide-to-gearbox-auto