E4OD Remanufactured Transmission

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The E4OD automatic transmission's design was inspired by Ford's very popular and successful C-6 platform and included a significant amount of upgrades, modifications, and overall improvements. The improvements included an improved hydraulic pump, a coast clutch that was upgraded, and planetary gear sets that had a higher contact ratio. Another favorable addition was the overdrive gearset that significantly improved the E4OD's fuel efficiency as compared to the C-6's direct-drive top gear. Also introduced with the E4OD transmission was the use of electric shift solenoids to replace the shift functions and hydraulic pressure regulations, thus introducing the concept of electronic shift controls. This resulted in the electrical commanding of shifts with the employment of the EEC-IV onboard control processor.

The name given to the transmission control processor by Ford was the \'Electronic Control Assembly (ECA). The ECA can and often is interpreted as a TCM (transmission control module) for modern transmissions. The ECA serves the purpose of regulating transmission line pressure, controlling torque converter lockup sequence, providing certain diagnostics, and controlling the shift timing of the transmission. When utilized in gasoline applications, the ECA controls electrical functionality for both the transmission and the engine. When used in diesel applications though, the ECA performs as a stand-alone control mechanism for the transmission and does not participate in controlling any engine functionality.

And while the E4OD transmission was the sole automatic transmission utilized in the diesel Power Stroke up until the 1998 model year, it is often necessary to differentiate the E4OD transmission from light-duty AOD & AODE gasoline applications. This difference is achieved with the examination and comparison of the following shift patterns:

E4OD Pattern: P R N OD 2 1

AODE / AOD Pattern: P R N OD D 1

When comparing the two shift sequences, the primary difference is that while the AOD has a D position, the E4OD has a "2" position. And even though exceptions to this rule may occur, this should remain true when applied to both F-Series and Bronco vehicle applications. Ultimately the E4OD transmission was replaced by the 4R100 transmission which was Ford's revised naming convention for their drivetrain products. And while similar to the E4OD, the 4R100 was not interchangeable with the same. The 4R100 represented the changes necessary by Ford to upgrade and improve the transmission for their automatic transmission platform in keeping pace with the evolved F-Series diesel vehicles.