Ford and GM announced a joint venture to share automatic transmission designs in April 2013: GM would adopt a 10-speed longitudinal transmission primarily designed by Ford, while Ford would adopt the GM 9T 9-speed transverse transmission.[1] Ford declined to use the GM 9T, however, as the promised improvement in fuel consumption was less than expected, and removed one gear, resulting in the Ford 8F35.[2][3]
At the same time, Ford also launched the 8F24 and 8F57 transmissions. The 8F24 is unique to Ford, while the 8F57 is derived from an earlier GM-Ford 6-speed automatic transmission.[4]
Models
8F24
The 8F24 is designed for engines with a maximum output of 240 N⋅m (180 lbf⋅ft).[4]
The 8F35 is derived from the GM 9T50[5] and both share components with the GM 6T40 and Ford 6F35.[6] The change in ratio between the 2nd and 3rd gears is relatively small;[4] in later versions, the transmission is instructed to skip 2nd gear entirely to enhance throttle response.[7] It uses six solenoids (on two driving clutches and four brake clutches), and a selectable one-way clutch, applied in different combinations to engage the eight forward speeds and reverse.[8] It is designed for engines with a maximum output of 350 N⋅m (260 lbf⋅ft).[4]