GM 6T40 transmission
Encyclopedia
The Hydra-Matic 6T40 and similar 6T45 and 6T30 are transversely-mounted
six speed automatic transmission
s produced by General Motors
. The 6T40 made its debut in the 2008 Chevrolet Malibu
, available with the 2.4 litre LE5 Ecotec engine making 164 hp, and has since also be made available on the Chevrolet Cruze
, Daewoo Tosca
and Buick LaCrosse
. 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.
The 6T45 differs from the 6T40 in its use of heavier-duty components, allowing it to handle engines with greater torque. The 6T40 will be available in front-wheel drive configuration only (MH8), but the 6T45 will be adaptable to both FWD (MH7) and all-wheel drive (MHC). The transmission is based on the larger 6T70/75
, and will be produced at Ypsilanti, Michigan
, as well as at an undisclosed Shanghai GM
location. Since 2008, these transmissions have been produced by GM Daewoo
at the Boryeong Transmission Plant in Boryeong
, South Korea
. The facility is currently capable of producing up to 300,000 Hydra-Matic six-speed automatic transmissions annually.
6T30 is a recent more compact and lightweight variant used on the North American Chevrolet Cruze
and Chevrolet Sonic.
Gear ratios (6T40):
Transverse engine
A transverse engine is an engine mounted in a vehicle so that the engine's crankshaft axis is perpendicular to the long axis of the vehicle. Many modern front wheel drive vehicles use this engine mounting configuration...
six speed automatic transmission
Automatic transmission
An automatic transmission is one type of motor vehicle transmission that can automatically change gear ratios as the vehicle moves, freeing the driver from having to shift gears manually...
s produced by General Motors
General Motors
General Motors Company , commonly known as GM, formerly incorporated as General Motors Corporation, is an American multinational automotive corporation headquartered in Detroit, Michigan and the world's second-largest automaker in 2010...
. The 6T40 made its debut in the 2008 Chevrolet Malibu
Chevrolet Malibu
Malibus and all other Chevelles were completely restyled for 1968 with semi-fastback rooflines on two-door hardtops and wheelbases split to on two-door models and 118 for four-door sedans and station wagons. Engine offerings included a new V8 rated at that replaced the V8 that had served as the...
, available with the 2.4 litre LE5 Ecotec engine making 164 hp, and has since also be made available on the Chevrolet Cruze
Chevrolet Cruze
The Chevrolet Cruze is a General Motors automobile, spanning two unrelated models. The original iteration, a subcompact crossover SUV, was manufactured by Suzuki in Japan between 2001 and 2008 under joint venture with GM...
, Daewoo Tosca
Daewoo Tosca
The Daewoo Tosca is a mid-size car built by GM Daewoo in South Korea and marketed worldwide by General Motors as the Chevrolet Epica, Chevrolet Tosca and Holden Epica. Codenamed V250, it replaces the Daewoo Magnus and its derivatives. The Chevrolet Epica was officially launched in Europe at the...
and Buick LaCrosse
Buick LaCrosse
The Buick LaCrosse is a mid-size entry-level luxury sedan produced by General Motors. It replaced the Buick Century and Regal in North America beginning in the 2005 model year.-North America:...
. 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.
The 6T45 differs from the 6T40 in its use of heavier-duty components, allowing it to handle engines with greater torque. The 6T40 will be available in front-wheel drive configuration only (MH8), but the 6T45 will be adaptable to both FWD (MH7) and all-wheel drive (MHC). The transmission is based on the larger 6T70/75
GM-Ford 6-speed automatic transmission
General Motors and Ford Motor Company cooperated in 2002 to create a new automatic transaxle, designed for transverse engine applications in cars and light trucks...
, and will be produced at Ypsilanti, Michigan
Ypsilanti, Michigan
Ypsilanti is a city in Washtenaw County in the U.S. state of Michigan. As of the 2000 census, the city population was 22,362. The city is bounded to the north by the Charter Township of Superior and on the west, south, and east by the Charter Township of Ypsilanti...
, as well as at an undisclosed Shanghai GM
Shanghai GM
Shanghai General Motors Company Ltd. is a joint venture between General Motors Company and Shanghai Automotive Industry Corporation that manufactures and sells Chevrolet, Buick, and Cadillac brand automobiles in mainland China. Shanghai GM was founded on June 12, 1997 with 50% investment each...
location. Since 2008, these transmissions have been produced by GM Daewoo
GM Daewoo
GM Korea Company is South Korea's second largest automobile manufacturer and is a division of the General Motors Company. GM Korea's roots go back to the former Daewoo which was split from its parent company, Daewoo Group, in 2001...
at the Boryeong Transmission Plant in Boryeong
Boryeong
Boryeong, commonly known as Daecheon, is a city in South Chungcheong Province, South Korea. It is located at , 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 connected to the Seohaean Expressway...
, South Korea
South Korea
The Republic of Korea , , is a sovereign state in East Asia, located on the southern portion of the Korean Peninsula. It is neighbored by the People's Republic of China to the west, Japan to the east, North Korea to the north, and the East China Sea and Republic of China to the south...
. The facility is currently capable of producing up to 300,000 Hydra-Matic six-speed automatic transmissions annually.
6T30 is a recent more compact and lightweight variant used on the North American Chevrolet Cruze
Chevrolet Cruze
The Chevrolet Cruze is a General Motors automobile, spanning two unrelated models. The original iteration, a subcompact crossover SUV, was manufactured by Suzuki in Japan between 2001 and 2008 under joint venture with GM...
and Chevrolet Sonic.
Gear ratios (6T40):
| 1 | 2 | 3 | 4 | 5 | 6 | R | Final Drive |
|---|---|---|---|---|---|---|---|
| 4.584 | 2.964 | 1.912 | 1.446 | 1.00 | 0.746 | 2.94 | 2.89 |
Applications
- 2008 Chevrolet CruzeChevrolet CruzeThe Chevrolet Cruze is a General Motors automobile, spanning two unrelated models. The original iteration, a subcompact crossover SUV, was manufactured by Suzuki in Japan between 2001 and 2008 under joint venture with GM...
/Daewoo Lacetti PremiereChevrolet CruzeThe Chevrolet Cruze is a General Motors automobile, spanning two unrelated models. The original iteration, a subcompact crossover SUV, was manufactured by Suzuki in Japan between 2001 and 2008 under joint venture with GM...
/Holden CruzeChevrolet CruzeThe Chevrolet Cruze is a General Motors automobile, spanning two unrelated models. The original iteration, a subcompact crossover SUV, was manufactured by Suzuki in Japan between 2001 and 2008 under joint venture with GM... - 2008 Chevrolet MalibuChevrolet MalibuMalibus and all other Chevelles were completely restyled for 1968 with semi-fastback rooflines on two-door hardtops and wheelbases split to on two-door models and 118 for four-door sedans and station wagons. Engine offerings included a new V8 rated at that replaced the V8 that had served as the...
- 2008 Daewoo ToscaDaewoo ToscaThe Daewoo Tosca is a mid-size car built by GM Daewoo in South Korea and marketed worldwide by General Motors as the Chevrolet Epica, Chevrolet Tosca and Holden Epica. Codenamed V250, it replaces the Daewoo Magnus and its derivatives. The Chevrolet Epica was officially launched in Europe at the...
/Chevrolet EpicaDaewoo ToscaThe Daewoo Tosca is a mid-size car built by GM Daewoo in South Korea and marketed worldwide by General Motors as the Chevrolet Epica, Chevrolet Tosca and Holden Epica. Codenamed V250, it replaces the Daewoo Magnus and its derivatives. The Chevrolet Epica was officially launched in Europe at the...
/Chevrolet ToscaDaewoo ToscaThe Daewoo Tosca is a mid-size car built by GM Daewoo in South Korea and marketed worldwide by General Motors as the Chevrolet Epica, Chevrolet Tosca and Holden Epica. Codenamed V250, it replaces the Daewoo Magnus and its derivatives. The Chevrolet Epica was officially launched in Europe at the...
/Holden EpicaDaewoo ToscaThe Daewoo Tosca is a mid-size car built by GM Daewoo in South Korea and marketed worldwide by General Motors as the Chevrolet Epica, Chevrolet Tosca and Holden Epica. Codenamed V250, it replaces the Daewoo Magnus and its derivatives. The Chevrolet Epica was officially launched in Europe at the... - 2008 Buick LaCrosseBuick LaCrosseThe Buick LaCrosse is a mid-size entry-level luxury sedan produced by General Motors. It replaced the Buick Century and Regal in North America beginning in the 2005 model year.-North America:...
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(USA) with eAssist - 2012 Chevrolet Sonic