GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 Avalanche - 2WD 🢒 Engine 🢒 Engine Mechanical - Hybrid (HP2) 6.0L (LFA) 🢒 Oil Pan Replacement

Oil Pan Replacement 2WD

Removal Procedure

    Object Number: 1698082 Size: SH
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. For 1500 series vehicles, remove the oil pan skid plate bolts and skid plate, if equipped.

    3. Object Number: 1698083 Size: SH
  3. For 2500 series vehicles, loosen the 2 rear oil pan skid plate bolts, remove the 2 front oil pan skid plate bolts and skid plate, if equipped.
  4. Unbolt the steering rack and hang downward.

    5. Object Number: 1658109 Size: SH
  5. Place a suitable drain pan under the oil pan drain plug.
  6. Remove the oil pan drain plug (430).
  7. Allow the oil pan to drain completely.

    8. Notice: Refer to Fastener Notice in the Preface section.

  8. Re-install the oil pan drain plug.

    9. Tighten
    Tighten the oil pan drain plug to 25 N·m (18 lb ft).


    Object Number: 1658113 Size: SH
  9. Place the drain pan under the oil filter.
  10. Remove the oil filter (437).
  11. Allow the oil to drain completely.
  12. Re-install the oil filter.

    13. Tighten
    Tighten the oil filter to 30 N·m (22 lb ft).


    Object Number: 1970180 Size: SH
  13. Remove the right side transmission cover bolt (2).

    14. Object Number: 1698086 Size: SH
  14. Remove the left side transmission cover bolt and cover.

    15. Object Number: 1698280 Size: SH
  15. For 1500 series vehicles, remove the crossbar bolts/nuts and crossbar.

    16. Object Number: 1698282 Size: SH
  16. For 2500 series vehicles, remove the crossbar bolts/nuts and crossbar.

    17. Object Number: 1968780 Size: SH
  17. Remove the 2 lower transmission bolts (1).

    18. Object Number: 1968647 Size: SH
  18. Disconnect the engine harness electrical connector (1) from the oil level sensor.

    19. Object Number: 1968670 Size: SH
  19. Remove the air conditioning (A/C) compressor bracket bolts (1).

    20. Object Number: 683355 Size: SH
  20. Remove the oil pan bolts.
  21. Remove the oil pan.

    22. Object Number: 384699 Size: SH
  22. If reusing the oil pan perform the following steps, otherwise proceed to step 3 of the installation procedure.

    23. Important: DO NOT allow foreign material to enter the oil passages of the oil pan, cap or cover the openings as required.

  23. Drill out the oil pan gasket rivets (2), if necessary.
  24. Remove the oil pan gasket (1) from the pan.
  25. Discard the oil pan gasket.
  26. Discard the rivets, if necessary.

Installation Procedure

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.
   • Do not reuse the oil pan gasket.
   • It is not necessary to rivet the NEW gasket to the oil pan.


    Object Number: 451897 Size: SH
  1. If reusing the oil pan perform the following step, otherwise proceed to step 3.

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

  2. Place a NEW oil pan gasket onto the oil pan.
  3. Apply a 5 mm (0.20 in) bead of sealant, 20 mm (0.80 in) long to the engine block. Apply the sealant directly onto the tabs of the front cover gasket that protrudes into the oil pan surface. Refer to Adhesives, Fluids, Lubricants, and Sealers .

    4. Object Number: 451898 Size: SH
  4. Apply a 5 mm (0.20 in) bead of sealant, 20 mm (0.8 in) long to the engine block. Apply the sealant directly onto the tabs of the rear cover gasket that protrudes into the oil pan surface. Refer to Adhesives, Fluids, Lubricants, and Sealers .

    5. Object Number: 683355 Size: SH
  5. Install 1 oil pan bolt into a oil pan bolt hole and up through the gasket.
  6. Position and install the oil pan and the rest of the oil pan bolts.

    7. Notice: Refer to Fastener Notice in the Preface section.

  7. Tighten the oil pan bolts.

    8. Tighten

        • M6 Bolts--Tighten the bolt to 12 N·m 106 lb in).
        • M8 Bolts--Tighten the bolt to 25 N·m (18 lb ft).
  8. Install the 2 lower transmission bolts.

    9. Tighten
    Tighten the bolts to 50 N·m (37 lb ft).


    Object Number: 1968670 Size: SH
  9. Install the air conditioning (A/C) compressor bracket bolts  (1).

    10. Tighten
    Tighten the bolt to 50 N·m (37 lb ft).


    Object Number: 1968647 Size: SH
  10. Connect the engine harness electrical connector (1) to the oil level sensor.

    11. Object Number: 1698282 Size: SH
  11. For both the 1500 and 2500 series, perform the following steps prior to installing the crossbar bolts:
    12. 11.1. Remove all traces of the original adhesive patch.
    11.2. Clean the threads of the bolts with denatured alcohol or equivalent and allow to dry.
    11.3. Apply threadlock GM P/N 12345493 (Canadian P/N 10953488) or equivalent to the bolt threads.
  12. For 2500 series vehicles, install the crossbar and crossbar bolts/nuts.

    13. Tighten
    Tighten the nuts to 120 N·m (89 lb ft).


    Object Number: 1698280 Size: SH
  13. For 1500 series vehicles, install the crossbar and crossbar bolts/nuts.

    14. Tighten
    Tighten the nuts to 100 N·m (74 lb ft).


    Object Number: 1698086 Size: SH
  14. Position the left side transmission cover and install the cover bolt.

    15. Tighten
    Tighten the bolt to 12 N·m (106 lb in).


    Object Number: 1970180 Size: SH
  15. Install the right side transmission cover bolt (2).

    16. Tighten
    Tighten the bolt to 12 N·m (106 lb in).


    Object Number: 1658113 Size: SH
  16. If reusing the old oil pan remove the old oil filter and install a NEW oil filter.
  17. Lubricate the NEW oil filter seal with clean engine oil.
  18. Install the NEW oil filter (437).

    19. Tighten
    Tighten the oil filter to 30 N·m (22 lb ft).


    Object Number: 1658109 Size: SH
  19. Install the oil pan drain plug (430).

    20. Tighten
    Tighten the drain plug to 25 N·m (18 lb ft).

  20. Raise the steering rack in place and install the steering rack bolts.

    21. Tighten

        • Tighten the left side steering rack bolts to 200 N·m (148 lb ft).
        • Tighten the right side steering rack bolts to 100 N·m (74 lb ft).

    Object Number: 1698083 Size: SH
  21. For 2500 series vehicles, position the oil pan skid plate and tighten until snug the 2 rear oil pan skid plate bolts, install the 2 front oil pan skid plate bolts, if equipped.

    22. Tighten
    Tighten the bolts to 28 N·m (21 lb ft).


    Object Number: 1698082 Size: SH
  22. For 1500 series vehicles, position the oil pan skid plate and install the oil pan skid plate bolts, if equipped.

    23. Tighten
    Tighten the bolts to 28 N·m (21 lb ft).

  23. Lower the vehicle.
  24. Fill the engine with NEW engine oil. Refer to Fluid and Lubricant Recommendations and Approximate Fluid Capacities .
  25. Start the engine and inspect for leaks.

Oil Pan Replacement 4WD

Removal Procedure

    Object Number: 1698082 Size: SH
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. For 1500 series vehicles, remove the oil pan skid plate bolts and skid plate, if equipped.

    3. Object Number: 1698083 Size: SH
  3. For 2500 series vehicles, loosen the 2 rear oil pan skid plate bolts, remove the 2 front oil pan skid plate bolts and skid plate, if equipped.
  4. Remove the front differential carrier. Refer to Differential Carrier Assembly Replacement .
  5. Unbolt the steering rack and hang downward.

    6. Object Number: 1658109 Size: SH
  6. Place a suitable drain pan under the oil pan drain plug.
  7. Remove the oil pan drain plug (430).
  8. Allow the oil pan to drain completely.

    9. Notice: Refer to Fastener Notice in the Preface section.

  9. Re-install the oil pan drain plug.

    10. Tighten
    Tighten the oil pan drain plug to 25 N·m (18 lb ft).


    Object Number: 1658113 Size: SH
  10. Place the drain pan under the oil filter.
  11. Remove the oil filter (437).
  12. Allow the oil to drain completely.
  13. Re-install the oil filter.

    14. Tighten
    Tighten the oil filter to 30 N·m (22 lb ft).


    Object Number: 1970180 Size: SH
  14. Remove the right side transmission cover bolt (2).

    15. Object Number: 1698086 Size: SH
  15. Remove the left side transmission cover bolt and cover.

    16. Object Number: 1698280 Size: SH
  16. For 1500 series vehicles, remove the crossbar bolts/nuts and crossbar.

    17. Object Number: 1698282 Size: SH
  17. For 2500 series vehicles, remove the crossbar bolts/nuts and crossbar.

    18. Object Number: 1968780 Size: SH
  18. Remove the 2 lower transmission bolts (1).

    19. Object Number: 1968647 Size: SH
  19. Disconnect the engine harness electrical connector (1) from the oil level sensor.

    20. Object Number: 1968670 Size: SH
  20. Remove the air conditioning (A/C) compressor bracket bolts  (1).

    21. Object Number: 683355 Size: SH
  21. Remove the oil pan bolts.
  22. Remove the oil pan.

    23. Object Number: 384699 Size: SH
  23. If reusing the oil pan perform the following steps, otherwise proceed to step 3 of the installation procedure.

    24. Important: DO NOT allow foreign material to enter the oil passages of the oil pan, cap or cover the openings as required.

  24. Drill out the oil pan gasket rivets (2), if necessary.
  25. Remove the oil pan gasket (1) from the pan.
  26. Discard the oil pan gasket.
  27. Discard the rivets, if necessary.

Installation Procedure

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.
   • Do not reuse the oil pan gasket.
   • It is not necessary to rivet the NEW gasket to the oil pan.


    Object Number: 451897 Size: SH
  1. If reusing the oil pan perform the following step, otherwise proceed to step 3.

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

  2. Place a NEW oil pan gasket onto the oil pan.
  3. Apply a 5 mm (0.20 in) bead of sealant, 20 mm (0.80 in) long to the engine block. Apply the sealant directly onto the tabs of the front cover gasket that protrudes into the oil pan surface. Refer to Adhesives, Fluids, Lubricants, and Sealers .

    4. Object Number: 451898 Size: SH
  4. Apply a 5 mm (0.20 in) bead of sealant, 20 mm (0.8 in) long to the engine block. Apply the sealant directly onto the tabs of the rear cover gasket that protrudes into the oil pan surface. Refer to Adhesives, Fluids, Lubricants, and Sealers .

    5. Object Number: 683355 Size: SH
  5. Install 1 oil pan bolt into a oil pan bolt hole and up through the gasket.
  6. Position and install the oil pan and the rest of the oil pan bolts.

    7. Notice: Refer to Fastener Notice in the Preface section.

  7. Tighten the oil pan bolts.

    8. Tighten

        • M6--Tighten the bolts to 12 N·m (106 lb in).
        • M8--Tighten the bolts to 25 N·m (18 lb ft).

    Object Number: 1968780 Size: SH
  8. Install the 2 lower transmission bolts (1) until snug.

    9. Tighten
    Tighten the bolts to 50 N·m (37 lb ft).


    Object Number: 1968670 Size: SH
  9. Install the air conditioning (A/C) compressor bracket bolts (1).

    10. Tighten
    Tighten the bolt to 50 N·m (37 lb ft).


    Object Number: 1968647 Size: SH
  10. Connect the engine harness electrical connector (1) to the oil level sensor.

    11. Object Number: 1698282 Size: SH
  11. For both the 1500 and 2500 series, perform the following steps prior to installing the crossbar bolts.
    12. 11.1. Remove all traces of the original adhesive patch.
    11.2. Clean the threads of the bolts with denatured alcohol or equivalent and allow to dry.
    11.3. Apply threadlock GM P/N 12345493 (Canadian P/N 10953488) or equivalent to the bolt threads.
  12. For 2500 series vehicles, install the crossbar and crossbar bolts/nuts.

    13. Tighten
    Tighten the nuts to 120 N·m (89 lb ft).


    Object Number: 1698280 Size: SH
  13. For 1500 series vehicles, install the crossbar and crossbar bolts/nuts.

    14. Tighten
    Tighten the nuts to 100 N·m (74 lb ft).


    Object Number: 1698086 Size: SH
  14. Position the left side transmission cover and install the cover bolt.

    15. Tighten
    Tighten the bolt to 12 N·m (106 lb in).


    Object Number: 1970180 Size: SH
  15. Install the right side transmission cover bolt (2).

    16. Tighten
    Tighten the bolt to 12 N·m (106 lb in).


    Object Number: 1658113 Size: SH
  16. If reusing the old oil pan remove the old oil filter and install a NEW oil filter.
  17. Lubricate the NEW oil filter seal with clean engine oil.
  18. Install the NEW oil filter (437).

    19. Tighten
    Tighten the oil filter to 30 N·m (22 lb ft).


    Object Number: 1658109 Size: SH
  19. Install the oil pan drain plug (430).

    20. Tighten
    Tighten the drain plug to 25 N·m (18 lb ft).

  20. Install the front differential carrier. Refer to Differential Carrier Assembly Replacement .
  21. Raise the steering rack in place and install the steering rack bolts.

    22. Tighten

        • Tighten the left side steering rack bolts to 200 N·m (148 lb ft).
        • Tighten the right side steering rack bolts to 100 N·m (74 lb ft).

    Object Number: 1698083 Size: SH
  22. For 2500 series vehicles, position the oil pan skid plate and tighten until snug the 2 rear oil pan skid plate bolts, install the 2 front oil pan skid plate bolts, if equipped.

    23. Tighten
    Tighten the bolts to 28 N·m (21 lb ft).


    Object Number: 1698082 Size: SH
  23. For 1500 series vehicles, position the oil pan skid plate and install the oil pan skid plate bolts, if equipped.

    24. Tighten
    Tighten the bolts to 28 N·m (21 lb ft).

  24. Lower the vehicle.
  25. Fill the engine with NEW engine oil. Refer to Fluid and Lubricant Recommendations and Approximate Fluid Capacities .
  26. Start the engine and inspect for leaks.