Allison - Automatic Transmission

Pressure Switch Manifold Replacement

Removal Procedure





1. Remove the oil pan and transmission internal oil filter.

Important: Individual pressure switches cannot be replaced. When any pressure switch needs replacing, the entire assembly must be replaced.

Important: The modulated main pressure (MAIN MOD) solenoid has been removed for clarity.


Caution: Refer to Battery Disconnect Caution in Service Precautions.

2. Disconnect the internal wiring harness connector from the transmission fluid pressure (TFP) switch (2).
3. Remove six bolts (1). Remove the TFP switch (2).

Installation Procedure





1. Place the new TFP manifold assembly (2) in position and install one bolt (1) in a recessed location to hold in position. Start the remaining five bolts (1) in recessed locations and tighten the bolts by hand.
Torque the bolts to 12 Nm (108 inch lbs.).

Notice: Refer to Fastener Notice in Service Precautions.

2. Connect the internal wiring harness connector to the TFP switch.
3. Install the oil pan and transmission internal oil filter.