The GM–Ford 6-speed automatic transmission is an automatic transaxle originally designed for transverse engine applications in cars. With design work having begun in 2002, General Motors and Ford Motor Company jointly committed to investing US$720 million in their manufacturing plants to support the new transmission.
Each company has named and manufactured the transmission separately: Ford has built the 6F50 and 6F55 along with the 6F35 (related to the GM 6T40 transmission) at its Van Dyke Transmission Plant in Sterling Heights, Michigan, and later at Sharonville Transmission in Sharonville, Ohio. GM has built the 6T70, 6T75, and 6T80 at Warren Transmission in Warren, Michigan with production starting in July 2006.
Ford has claimed that the 6F50 is designed to handle 300 hp (224 kW) and 280 ft·lbf (380 N·m), while General Motors has rated their 6T70 to and , the 6T75 to and , and the 6T80 to and . GM has listed the wet (with fluids) weight of the 6T70/75/80 to be between and .
Ford has apparently not made a public statement regarding the 6F55's maximum capabilities, but has used it in AWD in the Taurus SHO with an engine rated at 272 kW (370 PS; 365 hp) and 475 N·m (350 lb·ft) of torque (final drive 2.77:1 standard or 3.16:1 with SHO Performance Pckage), as well as the tenth-generation Lincoln Continental with an engine rated at 400 hp (298 kW; 406 PS) and 400 lb⋅ft (542 N⋅m).
The first application of the technology was in the 2007 Ford Edge and Lincoln MKX crossover SUVs, as well as the Saturn Aura sedan and the Saturn Outlook crossover. It was also used for the Pontiac G6 GTP models and the GMC Acadia models for 2007. Prior to 2009, this transmission had issues caused by a very weak 3,5,R wave plate, which made this transmission prone to failure in GM products. Updated wave plates were released for many clutches in 6T70. The old-design wave plates were not stress-relieved and could break with use. The updated wave plates have been available under the following part numbers:
Gear ratios:
Applications:
GM: 2007–2010 Saturn Aura XR (LY7 V6 option) 2007 Pontiac G6 GTP 2007–2009 Saturn Outlook 2007–2017 GMC Acadia 2008–2009 Saturn Aura XR 2008–2009 Pontiac G6 GXP 2008–2017 Buick Enclave 2008–2009 Chevrolet Equinox Sport 2008–2012 Chevrolet Malibu (LY7 V6 option) 2008–2009 Pontiac Torrent GXP 2009–2017 Chevrolet Traverse 2010–2017 Chevrolet Equinox (LF1, LFW, LFX V6 option) 2010–2016 Cadillac SRX 2010–2016 Buick LaCrosse (LF1, LLT, LFX V6 options) 2012–2020 Chevrolet Impala 2013–2019 Cadillac XTS 2010–2017 GMC Terrain (LF1, LFW, LFX V6 option)
Ford: 2007–2018 Ford Edge 2007–2018 Lincoln MKX 2008–2019 Ford Taurus 2008–2009 Ford Taurus X 2008–2009 Mercury Sable 2009–2019 Ford Flex 2009–2016 Lincoln MKS 2009–2012 Ford Escape 2009–2011 Mercury Mariner 2009–2011 Mazda Tribute 2010–2020 Ford Fusion 2013–2020 Lincoln MKZ 2010–2011 Mercury Milan 2010–2019 Ford Taurus 2011–2019 Ford Explorer 2012–2022 Ford Mondeo 2015–2018 Ford C-Max with 1.5L EcoBoost 2016–2019 Ford Focus with 1.5L EcoBoost 2017–2020 Lincoln Continental