Consequently, gearbox is important to manage output speed & torque. As per the necessity of your automobile, we could achieve various speeds or torque with the help of the gearbox. The overall Motors Hydra-Matic grew to become the initial mass-produced automatic transmission adhering to its introduction in 1939 (1940 product https://brookskqrqo.mdkblog.com/39993271/helping-the-others-realize-the-advantages-of-gearbox-auto