While there is some speculation that the 70 can be multiplied by 10 to indicate the pound-feet of torque this transmission is capable of handling, including torque converter multiplication, (i.e. In 1998, due to durability concerns, the intermediate one-way roller clutch was replaced with a mechanical diode providing extra holding capacity and longer service. On vehicles powered by the 5.4L V8, a stronger gearset is used than in normal duty 4R70Ws and Torque Converter stall speeds is also slightly lower because of the 5.4L’s increased low end torque opposed to the 4.6L. As a result, fuel economy is slightly increased and downshifting is slightly decreased for less wear. Unlike the AOD-E, Reverse, 1st, and 2nd gear ratios in the 4R70-W are numerically higher, giving the transmission a better mechanical advantage and in turn, better take-off acceleration, better passing acceleration, slightly lower fuel consumption, and designed for better gearset strength The 4th gear ratio in the 4R70-W is up 0.70:1 from 0.67:1.
1992 and up Ford F-Series trucks and E-Series vansĪ revised version of the AOD-E Transmission was released in 1993 with the Lincoln Mark VIII.While the AOD and AOD-E are similar to each other (oil pans, casings, bell-housing, and internals), they are not interchangeable with each other because the AOD-E's shift points are controlled electronically from a combination of solenoids and the Powertrain Control Module (PCM) while the AOD's shift points are hydraulically controlled by a throttle valve rod. It was mainly intended for the new Modular V8 at first, but it was also adapted to the old AOD bell-housing for vehicles still powered by pushrod engines. The AOD was redesigned with electronic controls in 1992, becoming the AOD-E. Initially called XT-LOD (Extension Lock-Up Overdrive) its name was changed when revisited in 1974 to FIOD (Ford Integrated Overdrive) and then to its final name in 1979, the Ford AOD transmission.
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The transmission was introduced when Ford started to downsize its full size line in 1979. The project was shelved with a design that lacked a damper in the torque converter but after the project was revisited a damper ultimately made its way into the final design. The XT-LOD was initially abandoned in 1966 but design began again in 1974 as a result of rising gas prices. The transmission featured a split-torque application for third gear as well as a lockup in the torque converter. Because it was based on the "X" transmissions, its gear ratios from 1-3 were the same with the fourth being 0.67:1. Where many transmissions had a fourth gear added on as an afterthought, Ford's new transmission was designed with a fourth gear integrated into the gearset. The new transmission was built around the Ravigneaux planetary gearset of the "X" transmissions. In 1962 Ford began working on a new type of automatic transmission that would emphasize fuel economy and driveability. The AOD replaced many of Ford's older transmissions such as the C4, C5, and light duty applications of the FMX. The gearset design is based on the Ford "X" automatic transmissions used during the 1950s, '60s, and '70s. Introduced in 1980, it was Ford's first four-speed automatic overdrive transmission. The AOD (automatic overdrive) is a four-speed automatic transmission, with the 4th gear as overdrive. 4-speed longitudinal automatic transmission
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