GM–Ford 6-speed automatic transmission

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.

6T/6F
Overview
ManufacturerGeneral Motors/Ford
Production2006–present
Body and chassis
Class6-speed transverse automatic transmission
Chronology
Predecessor4T60-E/4T65-E
4T80-E
AX4N

Each company has named and manufactured the transmission separately:

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 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 has listed the wet (with fluids) weight of the 6T70/75/80 to be between 102 kg (225 lb) and 104.7 kg (231 lb).

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:

ClutchPart Number
123424259063
2-624259816
3-5-Rev24254103
Low-Rev24259817

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:

Ford:

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. Retrieved November 9, 2005.
  • "New Hydra-Matic 6T70 Six-Speed Automatic Delivers Performance and Fuel Economy". TheAutoChannel. Retrieved January 20, 2006.
  • "Technologically Advanced Transmissions Enter GM Fleet". AutoTrends. Archived from the original on June 25, 2008. Retrieved June 3, 2008.

References
  1. "GM Powertrain Plans". AutoWeek. Retrieved August 23, 2006.
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