List of GM transmissions

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

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.

Heavy-duty rear wheel drive
  • 1971–19?? 3L80HD (heavy duty version of TH400)
Medium-duty rear wheel drive
Light-duty rear wheel drive
  • 1969–1998 TH180/TH180C/3L30 — 3-speed European/Asian model. Also manufactured and used by Holden as the Trimatic transmission.
Transverse front wheel drive
Longitudinal front wheel drive
  • 1966–1978 TH425 — 3-speed
  • 1979–1981 TH325 — 3-speed
  • 1982–1985 TH325-4L — 4-speed

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.

3/4/5/6 L/T ## -E
Number of forward gears L=Longitudinal
T=Transverse
GVWR rating "E" for Electronic
"HD" for Heavy Duty
First-generation longitudinal (Rear Wheel drive)
  • 1991–2001 4L30-E — 4-speed light-duty (used in BMW, Cadillac, Isuzu, and Opel cars)
  • 1992– 4L60-E/4L65-E — 4-speed medium-duty (used in GM trucks and rear-wheel-drive cars)
  • 1991– 4L80-E/4L85-E — 4-speed heavy-duty (used in GM trucks)
First-generation transverse (Front Wheel drive)
  • 1995–2010 4T40-E/4T45-E — 4-speed light-duty (used in smaller front wheel drive GM vehicles)
  • 1991–2010 4T60-E/4T65-E/4T65E-HD — 4-speed medium-duty (used in larger front wheel drive GM vehicles)
  • 1993–2010 4T80-E — 4-speed heavy-duty (used in large front wheel drive GM vehicles, only with Cadillac NorthStar V8.
Second-generation longitudinal (Rear Wheel drive)
  • 2000–2007 5L40-E/5L50 — 5-speed medium-duty (used in Cadillac's Sigma vehicles)
  • 2007– 6L45/6L50 — 6-speed medium-duty (used in GM Sigma platform cars)
  • 2006– 6L80/6L90 — 6-speed heavy-duty (used in GM trucks and performance cars)
  • 2014– 8L90 — 8-speed heavy-duty (used in GM trucks and performance cars)
Second-generation transverse (Front Wheel drive)

Other automatics[edit]

Future[edit]

  • 8-speed automatic transmission[2] (2016)[3]
  • 9-speed automatic transmission
  • 10-speed automatic transmission

Manual transmissions[edit]

Longitudinal transmissions[edit]


Transverse Transmissions[edit]


See also[edit]

References[edit]

  1. ^ "Hydra-Matic History: The First Automatic Transmission". Ate Up With Motor. 2010-05-29. Retrieved 2014-01-15. 
  2. ^ "Toledo gets $204 million for all-new 8-speed transmission". Retrieved 16 May 2011. 
  3. ^ "The 8-Speeds Are Coming". GM Inside News. 2012-02-17. Retrieved 2014-01-15.