Engineering:GM-Ford 6-speed automatic transmission
| 6T/6F | |
|---|---|
| Overview | |
| Manufacturer | General Motors/Ford |
| Production | 2006– |
| Body and chassis | |
| Class | 6-speed transverse automatic transmission |
| Chronology | |
| Predecessor | 4T60-E/4T65-E 4T80-E AX4N |
General Motors and Ford Motor Company cooperated in 2002 to create a new automatic transaxle, designed for transverse engine applications in cars. The companies jointly committed to investing US$720 million in their manufacturing plants to support the new transmission.
Each company will name and manufacture the transmission separately:
- Ford builds the 6F50 and 6F55 along with the 6F35 (related to the GM 6T40 transmission) at their Van Dyke Transmission Plant in Sterling Heights, Michigan, and in the future at Sharonville Transmission in Sharonville, Ohio.
- GM builds the 6T70, 6T75 and 6T80 at Warren Transmission in Warren, Michigan with production starting in July 2006.[1]
Ford claims the 6F50 is designed to handle 300 hp (224 kW) and 280 ft·lbf (380 N·m), while General Motors rates their 6T70 to 315 hp (235 kW) and 280 lb⋅ft (380 N⋅m), the 6T75 to 315 hp (235 kW) and 300 lb⋅ft (407 N⋅m), and the 6T80 to 410 hp (306 kW) and 369 lb⋅ft (500 N⋅m). GM lists the wet (with fluids) weight of the 6T70/75/80 to be between 102 kg (225 lb) and 104.7 kg (231 lb).
Ford appears not to have made a public statement regarding the 6F55's maximum capabilities, but uses 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 is 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 are available under the following part numbers:
| Clutch | Part Number |
|---|---|
| 1234 | 24259063 |
| 2-6 | 24259816 |
| 3-5-Rev | 24254103 |
| Low-Rev | 24259817 |
Gear ratios:
| 1 | 2 | 3 | 4 | 5 | 6 | R | Final drive |
|---|---|---|---|---|---|---|---|
| 4.484 | 2.872 | 1.842 | 1.414 | 1.000 | 0.742 | 2.88 | 2.77, 3.16, 3.39 |
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 Cadillac XTS
- 2010-2017 GMC Terrain (LF1, LFW, LFX V6 Option)
Ford:
- 2007 Ford Edge
- 2007 Lincoln MKX
- 2008 Ford Taurus
- 2008 Ford Taurus X
- 2008 Mercury Sable
- 2009 Ford Flex
- 2009 Lincoln MKS
- 2009 Ford Escape
- 2009 Mercury Mariner
- 2009 Mazda Tribute
- 2010 Ford Fusion
- 2013 Lincoln MKZ
- 2010 Mercury Milan
- 2010 Ford Taurus
- 2011 Ford Escape
- 2011 Ford Explorer
- 2012 Ford Mondeo
- 2015 Ford C-Max with 1.5 EcoBoost
- 2016 Ford Focus with 1.5 EcoBoost
- 2017 Lincoln Continental
See also
Sources
- "New fuel-saving 6-speed transaxle to propel Ford Edge to head of crossover utility class". Ford Motor Company press release. Archived from the original on October 5, 2012. https://web.archive.org/web/20121005092005/http://media.ford.com/article_display.cfm?article_id=21986. Retrieved November 9, 2005.
- "New Hydra-Matic 6T70 Six-Speed Automatic Delivers Performance and Fuel Economy". TheAutoChannel. http://www.theautochannel.com/news/2005/08/25/141299.html. Retrieved January 20, 2006.
- "Technologically Advanced Transmissions Enter GM Fleet". AutoTrends. Archived from the original on June 25, 2008. https://web.archive.org/web/20080625224549/http://www.autotrends.org/technology/transmissions/. Retrieved June 3, 2008.
References
- ↑ "GM Powertrain Plans". AutoWeek. http://autoweek.com/apps/pbcs.dll/article?AID=/20060823/FREE/60821020/1024/LATESTNEWS. Retrieved August 23, 2006.
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