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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 | |
| Manufacturer | General Motors/Ford |
| Production | 2006–present |
| Body and chassis | |
| Class | 6-speed transverse automatic transmission |
| Chronology | |
| Predecessor | 4T60-E/4T65-E 4T80-E AX4N |
| Successor |
|
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 and 104.7 kg (225 and 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 lbf⋅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 (300 kW; 410 PS) and 400 lb⋅ft (540 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:
| 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:
Ford: