Through the 1950s, all makers were working on their own automatic transmission, with four more developed inside GM alone.All of GMs early automatic transmissions were replaced by variants of the Turbo-Hydramatic by the 1970s.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. Also manufactured and used by Holden as the Trimatic transmission. Most early electronic transmissions use the -E designator to differentiate them from their non-electronic cousins, but this has been dropped on transmissions with no mechanical version like the new GM 6L80 transmission. Ford led the design of the 10-speed transmission, as well as filing the design patents for said transmission. According to an official report by the SAE (Society of Automotive Engineers) the design of the 10-speed gearbox is essentially all Ford, while GM was responsible for designing the 9-speed 9T transverse automatic gearbox. As part of their joint-venture, Ford will let GM use the 10-speed transmission with rights to modify and manufacture it for their own applications. ![]() Wikipedia is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization.
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