GM 6T40 transmission

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6T40/6T45
Manufacturer	General Motors
Production	2008–
Predecessor	4T40-E/4T45-E
Class	6-speed transverse automatic transmission

The Hydra-Matic 6T40 (and similar 6T45) is a transversely-mounted six speed automatic transmission produced by General Motors. It made its debut in the 2008 Chevrolet Malibu, available with the 2.4L LE5 Ecotec making 164 hp, and will also be made available on the Daewoo Tosca and Chinese-market Buick LaCrosse. 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).^[1] The transmission is based on the larger 6T70/75, and will be produced at Ypsilanti, Michigan, as well as by GM Daewoo and Shanghai GM at undisclosed locations.

Gear ratios:

1	2	3	4	5	6	R	Final Drive
4.58	2.96	1.91	1.45	1.00	0.75	2.94	2.89

Applications:

2008 Chevrolet Malibu
2008 Daewoo Tosca
2008 Buick LaCrosse (Chinese market)

The new automatic transmissions are also built at the GM Daewoo Boryeong Transmission Plant in Boryeong, Korea. The facility is currently capable of producing up to 300,000 Hydra-Matic six-speed automatic transmissions annually.