Important: Do not raise the engine block by the crankshaft balancer to perform this service procedure. Damage to the crankshaft balancer or the crankshaft may occur.

1. Disconnect the battery negative cables from the batteries. Refer to Battery Cable in Engine Electrical.
2. Remove the oil level indicator and tube from the engine. Refer to Oil Level Indicator and Tube Replacement .
3. Raise the vehicle.
4. Support the vehicle with safety stands.
5. Drain the engine oil.
6. Remove the flywheel from the crankshaft. Refer to Engine Flywheel Replacement .
7. Remove the transfer case from the vehicle if equipped.

•	For the vehicle equipped with Manual Four Wheel Drive or Selectable Four Wheel Drive, refer to Transfer Case Replacement in Driveline Axle.

•	For vehicles equipped with Auto Four Wheel Drive 2 Speed, refer to Transfer Case Replacement in Driveline Axle.

8. Remove the transmission from the vehicle.

•	For the 4L 80-E automatic transmission, refer to Transmission Replacement in Transmission/Transaxle.

•	For the NV 4500 manual transmission, refer to Transmission Replacement in Transmission/Transaxle.

9. Remove the clutch assembly if equipped. Refer to Clutch Assembly Replacement in Transmission/Transaxle.
10. Remove the flywheel from the crankshaft. Refer to Engine Flywheel Replacement .
11. Remove the oil pan bolts from the oil pan.
12. Remove the oil pan from the engine block.



13. Remove the rear seal on the from the oil pan.
14. Clean the old RTV sealant from the oil pan and engine block.

1. Apply a 2 mm (1/16 inch) bead of RTV sealant GM P/N 12345739 to the oil pan rear seal at the inside corners where the seal meets the rear crankshaft bearing cap on the engine block.
2. Install the oil pan rear seal to the rear crankshaft bearing cap before the sealer starts to dry.



3. Install the oil pan to the engine block.

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.

4. Install the oil pan bolts to the engine block.

Tighten

1. Tighten the bolts in the following order:
2. Tighten the two rear bolts to 17 N·m (23 lb ft).
3. Tighten all the other bolts to 10 N·m (89 lb in).
5. Install the clutch assembly to the flywheel (if removed). Refer to Clutch Assembly Replacement in Transmission/Transaxle.
6. Install the transmission in the vehicle.

•	For the 4L 80-E automatic transmission, refer to Transmission Replacement in Transmission/Transaxle.

•	For the NV 4500 manual transmission, refer to Transmission Replacement in Transmission/Transaxle.

7. Install the transfer case in the vehicle if equipped.

•	For the vehicle equipped with Manual Four Wheel Drive or Selectable Four Wheel Drive, refer to Transfer Case Replacement in Driveline Axle.

•	For vehicles equipped with Auto Four Wheel Drive 2 Speed, refer to Transfer Case Replacement in Driveline Axle.

8. Lower the vehicle.
9. Install the oil level indictor and tube to the engine block. Refer to Oil Level Indicator and Tube Replacement .
10. Fill the crankcase with engine oil. Refer to Engine Oil and Oil Filter Replacement .
11. Connect the battery negative cables to the batteries. Refer to Battery Cable in Engine Electrical.