Allison Transmissions
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AODThe AOD (for automatic overdrive) was a four-speed automatic transmission with overdrive. Introduced in 1980, it was Ford's first four-speed automatic overdrive transmission. The design is based on the same gearset as the Ford FMX transmission of the 1960s and 1970s. The AOD replaced the majority of Ford's older transmissions, including the Cruise-O-Matic and C5.
Gear ratios* 1st: 2.40:1
* 2nd: 1.47:1
* 3rd: 1.00:1
* 4th: 0.67:1
* Rev: 2.00:1
Further AOD application info:
AOD Shifter Pattern
The shifter pattern for the AOD is Park, Reverse, Neutral, Overdrive, Drive, and Low. The AOD does not have a conventional manual second gear position. You can hold second manually by pulling the shifter back into manual low after it has already shifted to second. If you are going above 20 MPH pulling the shifter into manual low will put the AOD in manual second. This is the factory design method for holding manual second with the AOD. -----------------------------------------------------------------------------------------------
AODE
The AOD was redesigned with electronic controls in 1991, becoming the AODE. 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 OHV engines. While the AOD and AODE/4r70w share some basic components like oil pans, gear sets (AODs and AODE can be retrofit with 4r70w gear sets), most of the internals are not interchangeable. The transmissions are not interchangeable either, as the AOD only uses a throttle valve cable for operation. The AODE and 4r70w are controlled by the Powertrain Control Module (PCM) also sometimes referred to as the Electronic Engine Control (EEC).
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4R70W
The 4R70W is a revised version of the AODE and was released in 1993 with the Lincoln Mark VIII. 4R70W stands for 4 gears, Rearwheeldrive, 70 number assigned by Ford which represents the input torque in Lb-Ft for which the transmission was designed times 10 (70 x 10 = 700 Lb-Ft) and Wide gear ratio. It has lower 1st and 2nd gear ratios for better take-off acceleration and improved gearset strength. On vehicles powered by a 5.4 L V8, a stronger gearset is used than in normal duty 4R70Ws. 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.
Gear ratios:1st: 2.84 :1
2nd: 1.55 :1
3rd: 1.00 :1
4th: 0.70 :1
Rev: 2.23 :1
