Important: The original oil pan gasket is retained and aligned to the oil pan by rivets. When installing a new gasket, it is not necessary to install new rivets.

1. If equipped with four wheel drive (4WD), remove the inner axle housing nuts and washers from the bracket.
2. Support the front drive axle with a suitable jack.



3. If equipped with 4WD, remove the differential carrier lower mounting bolt and nut.



4. If equipped with 4WD, remove the differential carrier upper mounting bolt and nut.
5. Lower the front drive axle.



6. Remove the steering linkage shield, if equipped.



7. Remove the oil pan underbody shield.



8. Remove the cross brace if equipped.
9. Drain the engine oil and remove the engine oil filter. Refer to Engine Oil and Oil Filter Change .



10. Remove the transmission to oil pan bolts.



11. Disconnect the oil level sensor electrical connector.
12. Remove two front wiring harness retainer bolts.



13. Remove the engine wiring harness retainer bolts from the engine oil pan.
14. Remove the engine oil cooler pipe to oil pan bolt.
15. Remove the transmission oil cooler pipe retainer and the bolt from the oil pan.
16. Remove the closeout covers and bolts (one each side of engine).
17. Lower the vehicle.



18. Remove engine mount bolts (3) each side.
19. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.



20. Remove the engine oil pan. Refer to Oil Pan Removal
21. Clean and inspect all parts. Refer to Oil Pan Cleaning and Inspection

Important: The alignment of the structural oil pan is critical. The rear bolt hole locations of the oil pan provide mounting points for the transmission bellhousing. To ensure the rigidity of the powertrain and correct transmission alignment, it is important that the rear of the block and the rear of the oil pan must NEVER protrude beyond the engine block and transmission bellhousing plane.

1. Apply a 5 mm (0.20 in) bead of sealant GM P/N 12378190 or equivalent 20 mm (0.8. in) long to the engine block.
2. Apply the sealant directly onto the tabs of the front cover gasket that protrudes into the oil pan surface.



3. Apply a 5 mm (0.20 in) bead of sealant GM P/N 12378190 or equivalent 20 mm (0.8. in) long to the engine block.
4. Apply the sealant directly onto the tabs of the rear cover gasket that protrudes into the oil pan surface.

Important: Be sure to align the oil gallery passages in the oil pan and engine block properly with the oil pan gasket.




5. Pre-assemble the oil pan gasket to the pan.

•	Install the gasket onto the pan.

•	Install the oil pan bolts to the pan through the gasket.

6. Install the oil pan, gasket and bolts to the engine block.
7. Snug the oil pan bolts finger tight. Do not overtighten.
8. Install the two lower bellhousing bolts to position the oil pan correctly.
9. Snug the lower bellhousing bolt finger tight. Do not overtighten.

Tighten

1. Tighten the oil pan-to-block and oil pan-to-oil pan front cover bolts to 25 N·m (18 lb ft).
2. Tighten the oil pan-to-rear cover bolts to 12 N·m (106 lb in).
3. Tighten the bellhousing bolts to 50 N·m (37 lb ft).



10. Install the transmission oil cooler pipe retainer and the bolt to the oil pan. Refer to Fastener Tightening Specifications .
11. Install the engine oil cooler pipe to oil pan bolt.

Tighten
Tighten the nut to 10 N·m (89 lb ft).

12. Install the engine wiring harness retainer bolts to the engine oil pan.



13. Connect the oil level sensor electrical connector.



14. Install the transmission to oil pan bolts.

Tighten
Tighten the bolts to 55 N·m (41 lb ft).

15. Install the front differential if equipped with four wheel drive. Refer to Differential Carrier Assembly Replacement in Front Axle.



16. Raise the front drive axle into position.
17. If equipped with 4WD, install the differential carrier upper mounting bolt and nut until snug. Do not tighten at this time.



18. If equipped with 4WD, install the differential carrier lower mounting bolt and nut.

Tighten
Tighten the bolts to 100 N·m (75 lb ft).




19. If equipped with 4WD, install the inner axle housing nuts and washers to the bracket.

Tighten
Tighten the nuts to 100 N·m (75 lb ft).

20. Remove the jack from the front drive axle.
21. Fill the engine with oil and install the engine oil filter. Refer to Engine Oil and Oil Filter Change .