The Hydra-Matic 6T40 and similar 6T45, 6T50 and 6T30 are transversely-mounted six speed

automatic transmission An automatic transmission (sometimes abbreviated to auto or AT) is a multi-speed transmission used in internal combustion engine-based motor vehicles that does not require any input from the driver to change forward gears under normal driving ...

s produced by General Motors. The 6T40, referred to in GM inner circles as the GF6, made its debut in the 2008

Chevrolet Malibu The Chevrolet Malibu is a mid-size car manufactured and marketed by Chevrolet from 1964 to 1983 and again since 1997. The Malibu began as a trim-level of the Chevrolet Chevelle, becoming its own model line in 1978. Originally a rear-wheel-dr ...

, available with the 2.4 L '' LE5'' ''Ecotec'' engine making , and has since also been made available on the

Chevrolet Cruze The Chevrolet Cruze is a compact car that is produced by General Motors since 2008. It was designated as a globally developed, designed, and manufactured four-door compact sedan, complemented by a five-door hatchback body variant from 2011, and ...

Daewoo Tosca The Daewoo Tosca is a mid-size car designed by Daewoo in South Korea and marketed by Chevrolet as the Chevrolet Epica and Chevrolet Tosca, while Holden marketed it as the Holden Epica. Codenamed ''V250'', it replaces the Daewoo Magnus and its d ...

and

Buick LaCrosse The Buick LaCrosse is a mid-size sedan manufactured and marketed by Buick since 2004. The LaCrosse is now in its third generation, slotted above the Buick Regal as the brand's flagship vehicle. The first-generation LaCrosse replaced the Century ...

. It features clutch-to-clutch shifting, eliminating the bands used on older transmission designs. GM chose an "on-axis" design as opposed to folding the gearset behind the engine and transferring power through the use of a chain, as is used in most other GM front wheel drive transaxles.

Ford Motor Company Ford Motor Company (commonly known as Ford) is an American multinational automobile manufacturer headquartered in Dearborn, Michigan, United States. It was founded by Henry Ford and incorporated on June 16, 1903. The company sells automobi ...

also produces their own variant, called the 6F35. The Buick Encore uses the 6F35 mated to the 1.4 turbo. The 6T45 differs from the 6T40 in its use of heavier-duty components, allowing it to handle engines with greater torque. The 6T40 and 6T50 are available in

front-wheel drive Front-wheel drive (FWD) is a form of engine and transmission layout used in motor vehicles, where the engine drives the front wheels only. Most modern front-wheel drive vehicles feature a transverse engine, rather than the conventional longitu ...

configuration only (MH8 and MUK), with the 6T40 also being paired with eAssist (MHH), but the 6T45 will be adaptable to both front-wheel drive (MH7) and

all-wheel drive An all-wheel drive vehicle (AWD vehicle) is one with a powertrain capable of providing power to all its wheels, whether full-time or on-demand. The most common forms of all-wheel drive are: ;1x1 : All unicycles Reflecting one axle with one w ...

(MHC). The 6T50 is available in front-wheel or all wheel drive as well. The transmission is based on the larger 6T70/75, and is produced at

Toledo, Ohio Toledo ( ) is a city in and the county seat of Lucas County, Ohio, United States. A major Midwestern United States port city, Toledo is the fourth-most populous city in the state of Ohio, after Columbus, Cleveland, and Cincinnati, and according ...

, as well as in China. Since 2008, these transmissions have been produced by

GM Daewoo GM Korea Company ( ko, 한국지엠주식회사) is the South Korean subsidiary of multinational corporation General Motors. GMK is also the third largest automobile manufacturer in South Korea. GM Korea's roots go back to the former Daewoo Mot ...

at the Boryeong Transmission Plant in

Boryeong Boryeong (), commonly known as Daecheon, is a city in South Chungcheong Province, South Korea. It is located on the coast of the Yellow Sea. It lies on the Janghang Line railroad, which connects it to Seoul via the Gyeongbu Line. It is also conne ...

South Korea South Korea, officially the Republic of Korea (ROK), is a country in East Asia, constituting the southern part of the Korean Peninsula and sharing a land border with North Korea. Its western border is formed by the Yellow Sea, while its eas ...

. The facility is currently capable of producing up to 300,000 Hydra-Matic six-speed automatic transmissions annually. The transmission is also produced in

Yantai Yantai, formerly known as Chefoo, is a coastal prefecture-level city on the Shandong Peninsula in northeastern Shandong province of People's Republic of China. Lying on the southern coast of the Bohai Strait, Yantai borders Qingdao on the ...

, China. 6T30 is a recent more compact and lightweight variant used on 1.8 L engine equipped variants of the North American

and

Chevrolet Sonic The Chevrolet Aveo ( ) is a subcompact car (B-segment) marketed by General Motors since 2002. Originally marketed as the Daewoo Kalos, takeover of Daewoo Motors by General Motors (GM) also saw the car being marketed under seven brands ( Chevrole ...

. The 6T40 was still used in those models equipped with the 1.4 L turbocharged engine. GM lists the weight of the 6T30 with fluids at , while the 6T40/45/50 weigh between and . GM launched the 6T35 250 nm, a higher torque variant of the 6T30, with the 2016 Cruze and its new 1.4 L turbocharged engine, saving space and approximately 24 lbs over the 6T40 used in the prior turbocharged Cruze.

Gear ratios

Gear ratios (6T40, 6T45): Gear ratios (6T30, 6T35):

Applications

* 2008

/ Daewoo Lacetti Premiere/ Holden Cruze * 2008

* 2008

Chevrolet Epica Epica or EPICA may refer to: * Epica (band), a Dutch symphonic metal band * ''Epica'' (Kamelot album), 2003 * ''Epica'' (Audiomachine album), 2012 * The European Project for Ice Coring in Antarctica (EPICA) * The Epica Awards (International Adver ...

/ Chevrolet Tosca/ Holden Epica * 2008

(China) * 2009

Saturn Aura The Saturn Aura is a four-door, five-passenger front engine/front-wheel drive mid-sized sedan manufactured and marketed by GM's Saturn subsidiary over a single generation from 2006–2009. The car launched one year before the seventh generatio ...

Pontiac G6 The Pontiac G6 is a mid-size car that was produced by General Motors under the Pontiac brand. It was introduced in 2004 for the 2005 model year to replace the Grand Am. The G6 shared the GM Epsilon platform with the Chevrolet Malibu, Saab 9-3 ...

(4-cylinder only) * 2010-2017

Chevrolet Equinox The Chevrolet Equinox is a series of crossover SUVs from Chevrolet introduced in 2004 for the 2005 model year. It replaces the North American Chevrolet Tracker and Chevrolet S-10 Blazer. The third-generation Equinox also replaced the first-g ...

(4 cylinder only) * 2010-2017

GMC Terrain The GMC Terrain is a crossover SUV by American manufacturer General Motors under its GMC marque. Sharing its platform with the Chevrolet Equinox, the first-generation Terrain was built on GM's Theta platform, while the second-generation model ...

(4 cylinder only) * 2010

Opel Astra The Opel Astra is a compact car/small family car (C-segment) developed and produced by the German automaker Opel since 1991, currently at its sixth generation. It was first launched in September 1991 as a direct replacement to the Opel Kadett. ...

Vauxhall Astra The Vauxhall Astra is a compact car/small family car (C-segment) that has been sold by Vauxhall since 1980. It is currently produced at Ellesmere Port, Cheshire, England. For its first two generations, the nameplate was applied to right-han ...

* 2010

Buick Regal The Buick Regal is a line of mid-size cars marketed by Buick since 1973. For nearly its entire production, the Regal has served as the premium mid-size/intermediate offering of the Buick product range. Introduced as a submodel of the Buick Centu ...

* 2011

Chevrolet Aveo The Chevrolet Aveo ( ) is a subcompact car (B-segment) marketed by General Motors since 2002. Originally marketed as the Daewoo Kalos, takeover of Daewoo Motors by General Motors (GM) also saw the car being marketed under seven brands (Chevrolet, ...

* 2012

(USA) with eAssist * 2012

* 2013

Chevrolet Trax The Chevrolet Trax is a crossover SUV manufactured by General Motors and marketed under the Chevrolet brand since 2013. The first generation model was released globally in 2013 as the smallest, entry-level crossover SUV offering from the bran ...

(Korea) * 2013 Buick Encore (U.S.) * 2013 Chevrolet Captiva Sport (U.S.) * 2014 Chevrolet Onix (Brazil) * 2014

(USA) * 2015

(USA)

References

* * {{dead link, date=January 2017 , bot=InternetArchiveBot , fix-attempted=yes 6

Gear ratios

Applications

See also

References