Allison Automatic Transmission

Flexplate/Torque Converter Vibration Test (8.1 L Gasoline Engines)
To determine and correct a torque converter vibration, use the following general procedure to achieve the best possible torque converter-to-flywheel balance.

1. Disconnect the battery. Refer to Battery Disconnect Caution in Service Precautions.
2. Raise the vehicle. Refer to Vehicle Lifting.





3. Remove the starter motor bolts and position the starter motor aside.
4. Remove the converter housing inspection cover.





5. Repeat this procedure until you obtain the best possible balance.
^ Unless already removed, remove the starter motor bolts and position the starter motor aside.
^ Remove the torque converter bolts.
^ Rotate the torque converter one bolt position.

Notice: Refer to Fastener Notice in Service Precautions.

^ Install the torque converter bolts.
^ Tighten the bolts to 60 Nm (44 ft. lbs.).
^ Install the starter motor and starter motor bolts.
^ Connect the battery. Refer to Battery Disconnect Caution in Service Precautions.
^ Start the vehicle and retest for vibration.
6. Disconnect the battery. Refer to Battery Disconnect Caution in Service Precautions.
7. Raise the vehicle. Refer to Vehicle Lifting.
8. Remove the starter motor bolts and position the starter motor aside.
9. Install the converter housing inspection cover.
10. Install the starter motor and starter motor bolts.
11. Lower the vehicle.
12. Connect the battery. Refer to Battery Disconnect Caution in Service Precautions.