Ford 2003 Mustang Workshop Manual page 2499

4. Using the special tool, install the intermediate clutch piston.
1. Position the intermediate clutch piston and the special tool onto the pump body.
2. Push the intermediate clutch piston to the bottom of the pump body bore, exerting even
pressure and remove the special tool.
5. CAUTION: The piston bleed hole must be located at 12 o'clock position (towards
the top of the transmission). Shift problems may occur if installed incorrectly.
NOTE: The piston bleed hole is the only round hole in the pump body.
Locate the piston bleed hole.
6. Install by snapping the spring retainer assembly on pump body.