Internals of the handbook transmission consist of a number of gears which you can find depending on your pace and driving situations. Larger gears supply more speed as an alternative to torque, that's great for smooth  driving over the freeway.  Typical Motors’ Hydra-Matic, released in 1940, was among the 1st, https://gearbox39146.loginblogin.com/40934712/the-ultimate-guide-to-gearbox-auto