Basic Motors’ Hydra-Matic, released in 1940, was among the main, making use of a hydraulic fluid coupling and planetary gearsets. This innovation created driving much more available by getting rid of the need for guide gear changes. For most cars, There are 2 key kinds of gearboxes: guide and automatic. https://gearboxauto85307.bloggip.com/33716292/5-simple-statements-about-gearbox-auto-explained