WEFOUNDA Manual Of General History: Being An Outline History Of The World From The Creation To The Present Time (1870)

General Motors is an innovator of automatic transmissions , introducing the Hydra-Matic in 1940. [1] This list includes some GM transmissions .

The GM Hydra-Matic was a success and installed in the majority of GM models by 1950. Through the 1950s, all makers were working on their own automatic transmission, with four more developed inside GM alone. All of GM's early automatic transmissions were replaced by variants of the Turbo-Hydramatic by the 1970s.

The Turbo-Hydramatic was used by all GM divisions, and formed the basis for the company's modern Hydramatic line. The basic rear-wheel drive Turbo-Hydramatic spawned two front-wheel drive variants, the transverse Turbo-Hydramatic 125 , and the longitudinal Turbo-Hydramatic 425 . A third variant was the light-duty rear wheel drive Turbo-Hydramatic 180 used in many European models.