GM 6T70 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 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 Package).

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 weren’t stress relieved and could break with use. The updated wave plates are available under the following part numbers:

Gear ratios:

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Wikipedia