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The Hydra-Matic 6T40 and similar 6T45, 6T50 and 6T30 are transversely-mounted six speed automatic transmissions produced by General Motors. The 6T40, referred to in GM inner circles as the GF6, made its debut in the 2008 Chevrolet Malibu, available with the 2.4L LE5 Ecotec engine making 164 horsepower (122 kW), 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. Ford also produces their own variant called the 6F35.
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 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 (MHC). The 6T50 is available in front-wheel or all wheel drive as well. The transmission is based on the larger 6T70/75, and will be produced at Toledo, Ohio, 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 1.8L engine equipped variants of the North American Chevrolet Cruze and Chevrolet Sonic. The 6T40 is still used in those models equipped with the 1.4L turbocharged engine. GM lists the weight of the 6T30 with fluids at 71.5 kg (158 lb), while the 6T40/45/50 weigh between 82 kg (181 lb) and 90 kg (198 lb).
Gear ratios (6T40, 6T45):
Gear ratios (6T30):
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