Thus, gearbox is important to manage output pace & torque. As per the necessity on the auto, we can obtain diverse speeds or torque with the assistance of a gearbox. The General Motors Hydra-Matic became the first mass-produced automatic transmission following its introduction in 1939 (1940 product yr). Obtainable as https://alexiskrvvt.theobloggers.com/40408301/the-basic-principles-of-gearbox-auto