List of GM transmissions

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

Automatic transmissions

Early models

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

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.

Heavy-duty rear wheel drive
Medium-duty rear wheel drive
Light-duty rear wheel drive
Transverse front wheel drive
Longitudinal front wheel drive

Electronic Hydra-Matics

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.

3/4/5/6L/T##-Elll
Number of forward gearsL=Longitudinal
T=Transverse
GVWR rating"E" for Electronic
"HD" for Heavy Duty
First-generation longitudinal (Rear Wheel drive)
First-generation transverse (Front Wheel drive)
Second-generation longitudinal (Rear Wheel drive)
Second-generation transverse (Front Wheel drive)

Other automatics

Future

- *This transmission is of Ford Motor Company's own in-house design, with Ford filing the design patents. Ford will let GM use the 10-speed transmission as part of their joint venture agreement. In-return, General Motors will let Ford use its GM designed 9-speed transmission (transverse gearbox) for front-wheel drive cars.[2] [3]

Manual transmissions

Longitudinal transmissions

Transverse Transmissions

See also

References

  1. "Hydra-Matic History: The First Automatic Transmission". Ate Up With Motor. 2010-05-29. Retrieved 2014-01-15.
  2. "Exclusive: An Inside Look At Ford’s New 10 Speed Transmission". http://www.thetruthaboutcars.com/. Retrieved 2015-03-16. External link in |publisher= (help)
  3. Brooke, Lindsay. "Ford and GM finally consummate 9- and 10-speed joint development". articles.sae. SAE International. Retrieved 20 March 2016.
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