Overdrive Servo

4R70E/4R75E

Overdrive Servo





Removal

1. Remove the main control valve body. For additional information, refer to Main Control Valve Body Main Control Valve Body.

2. NOTICE: If the Servo Piston Remover/Installer tool is not available, extreme care must be taken. Spring pressure will force Overdrive (O/D) servo piston assembly out of case. Case bore damage may result from trying to pry on O/D servo internal retaining ring.

Using the Servo Piston Remover/Installer, compress the servo spring to remove the overdrive servo retaining ring.





3. Remove the overdrive servo piston and return spring.





Installation

1. Install the O/D servo piston assembly.

1. Install the O/D servo piston return spring.

2. Install the O/D servo piston assembly.





2. Use the Servo Piston Remover/Installer to install the O/D servo piston retaining ring.





3. Install the main control valve body. For additional information, refer to Main Control Valve Body Main Control Valve Body.