Notice: Some Engine/Transmission combinations cannot be balance in this manner, due to the limited clearances between the transmission torque converter bolts and the engine. Be sure that the bolts do not bottom out in the lug nuts, or the transmission converter cover could be dented, and cause internal damage.

1. Start the engine.
2. Place the transmission in P (Park) or N (Neutral).
3. Run the engine at idle speed.
4. Observe the vibration.
5. Shut OFF the engine.

1. Disconnect the negative battery cable. Refer to the

   Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

   in General Information.
2. Raise the vehicle. Refer to Vehicle Lifting and Jacking in General Information.
3. Support the vehicle with safety stands.
4. Remove the starter motor. Refer to Starter Motor Replacement in Engine Electrical.




Important: The torque converter to flywheel bolts can be accessed through the starter mounting port on all 4L60-E transmissions with 4.3L engines.

5. Remove the converter cover bolts.
6. Remove the converter cover.



7. Remove the torque converter to flywheel bolts. Discard the flywheel bolts.



8. Rotate the torque converter 120 degrees (1/3 turn).

Notice: Be sure that the bolts do not bottom out in the lug nuts, or the transmission converter cover could be dented, and cause internal damage.

Important: Hand start all torque converter to flywheel bolts before torquing. This will ensure proper alignment and avoid cross threading.





Important: The torque converter to flywheel bolts can be accessed through the starter mounting port on all 4L60-E transmissions with 4.3L engines.

1. Install the flywheel to torque converter bolts. Use new flywheel to torque converter bolts with retaining compound removed from the first three threads of each bolt.

Tighten
Tighten the bolts to 63 N·m (46 lb ft).

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.




2. Install the converter cover and the bolts.

Tighten
Tighten the bolts to 10 N·m (89 lb in).

3. Install the starter. Refer to Starter Motor Replacement in Engine Electrical.
4. Lower the vehicle.
5. Connect the negative battery cable.

Tighten
Tighten the cable to 15 N·m (11 lb ft).

6. Start the engine and check for vibration. Repeat this procedure until the best possible balance is obtained.