For that reason, gearbox is important to manage output velocity & torque. According to the need from the automobile, we will reach different speeds or torque with the assistance of a gearbox. The General Motors Hydra-Matic grew to become the main mass-developed automatic transmission subsequent its introduction in 1939 (1940 https://gearbox-auto10752.theblogfairy.com/33299504/the-gearbox-auto-diaries