General Motors is an innovator of automatic transmissions, introducing the Hydra-Matic in 1940.[1] This list includes some GM transmissions. Show
Automatic transmissions[edit]Early models[edit]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.
Turbo-Hydramatic[edit]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. In Argentina, the Turbo Hydra-Matic was available on some models of the 1969-1978 Chevrolet "Chevy," essentially the 1968 U.S. Nova, but was marketed as the "Chevromatic."
Electronic Hydra-Matics[edit]The next-generation transmissions, introduced in the early 1990s, were the electronic Hydra-Matics based on the Turbo-Hydramatic design. 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. Today, GM uses a simple naming scheme for their transmissions, with the "Hydra-Matic" name used on most automatics across all divisions.
*This transmission is part of a joint-venture between General Motors and Ford Motor Company to split development of two transmissions, a longitudinal 10-speed and transverse 9-speed. 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. In-exchange for Ford's 10-speed transmission, General Motors will let Ford use its 9-speed transmission for front-wheel drive applications; Ford ultimately declined use of the 9T and instead, removed 1 gear and used the 9T as an 8-speed transmission.[2] [3][4] Second-generation transverse (Front Wheel drive)
Hybrid and PHEV[edit]
Other automatics[edit]
Future[edit]Manual transmissions[edit]Longitudinal transmissions[edit]
Transverse Transmissions[edit]
See also[edit]
References[edit]
What transmission does a GMC Sierra 2500 have?Sierra 2500HD. Do GMC 2500 have Allison transmission?The GMC Sierra 2500 HD came equipped with the 4L60E transmission, 4L65E transmission and 4L80E transmission in early models. Later models got the 6L90 6-speed transmission, and the GMC Sierra 2500HD 6.6L Duramax Diesel had the Allison 1000 transmission.
What transmission does a 1999 GMC Sierra 2500 have?Used 1999 GMC Sierra 2500 Specs & Features. How do I know what transmission I have in my GMC Sierra?The simplest way to find your transmission type is to look in your owner's manual. Your manual should have the name and type of transmission, along with service information. If you've misplaced your owner's manual, most trucks have a white label printed on the inside of the driver's door.
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