The governor valve is stuck.

Clean or replace the governor screen and/or the governor. Refer to Allison service manuals.

The modulation is delayed.

Adjust the modulator. Refer to Transmission Modulator Cable Adjustment .

The mechanical actuator cable is kinked, broken, or not properly adjusted.

Replace or adjust, the cable. Refer to Allison service manuals.

The mechanical actuator is obstructed.

Replace the actuator. Refer to Allison service manuals.

The shift signal valve adjustment is too high.

Adjust the shift points. Refer to Allison service manuals.

The valves are sticking.

Replace or rebuild the control valve assembly. Refer to Allison service manuals.

The modulation is improper.

Inspect the modulator valve and the modulator body. Refer to Transmission Modulator Replacement .