Overhaul - AODE & AODE-W: Description

NOTE: The Ford AODE-W (wide gear ratio) transmission is also known as 4R70W.

NOTE: For testing and diagnostic procedures of electronic components, refer to:

For models with the EEC-IV Engine Control system, see AUTO TRANS DIAGNOSIS - AODE & AODE-W W/EEC-IV
For models with the EEC-V Engine Control system, see AUTO TRANS DIAGNOSIS - AODE & AODE-W W/EEC-V

AODE/AODE-W is a 4-speed, fully automatic transmission with electronic shift, converter clutch and line pressure controls. The AODE/AODE-W uses a double-pinion compound gearset to produce 4 forward speeds and reverse. The transmission uses 2 bands, 2 one-way roller clutches and 4 friction clutches to hold or drive the planetary gearset members. See Fig 1.

Shift control solenoids provide gear selection and are controlled by the EEC-IV microprocessor. For additional information on the EEC-IV system, refer to the appropriate G - TESTS W/ CODES article in ENGINE PERFORMANCE section.

The EEC-IV system has self-diagnostic capabilities. Fault codes for faulty engine and transmission sensors, switches and circuits are stored in the PCM and may be retrieved to aid diagnosis and repair.

Fig 1: Cross-Sectional View Of AODE/AODE-W

Courtesy of FORD MOTOR CO.