For that reason, gearbox is essential to control output pace & torque. As per the necessity with the vehicle, we can realize distinctive speeds or torque with the help of a gearbox. The overall Motors Hydra-Matic became the very first mass-generated automatic transmission pursuing its introduction in 1939 (1940 model https://claytonnplfa.isblog.net/top-guidelines-of-gearbox-auto-51292322