Important: The floor rear extension panel is serviced as a single component (1). The reinforcement structure for the floor panel is a separate part (2) and can only be serviced separately. In most, cases, this reinforcement will need to be replaced in the event the floor panel extension is to be replaced.

Caution: Refer to Approved Equipment for Collision Repair Caution in the Preface section.

1. Disable the SIR system. Refer to SIR Disabling and Enabling .
2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .



3. Remove all related panels and components, including jack stowaway mount in right rear corner of vehicle.
4. Visually inspect and repair as much of the damage as possible to factory specifications. Refer to Dimensions - Body .

Caution: Refer to Foam Sound Deadeners Caution in the Preface section.

5. Note the location and remove the sealers and anti-corrosion materials from the repair area, as necessary. Refer to Anti-Corrosion Treatment and Repair .

Important: The rear corners of the original panel (3) must be cut to remove the panel from the vehicle.

6. Locate, mark, and drill out factory welds necessary to remove the extension panel.

Important: If a rear door hinge pillar inner reinforcement is to be replaced it is not necessary to perform step 6 of the Installation Procedure.




7. Loosen all body to frame mount bolts, remove all but 2 in the radiator core support and the 2 front body bolts.
8. Lift body off the frame, place 4x4 wood blocks (1) to support the body.




Important: Do not damage any inner panels or reinforcements.

9. Locate, mark, and drill out welds to remove the body mount anchor plates (1) and the floor panel reinforcement.
10. Remove the foam air baffles (2) from the right and left floor extensions, these need to be reinstalled during assembly.

1. Drill holes for plug welding as necessary to install the service panels.
2. Clean and prepare all mating surfaces as necessary.
3. Apply GM-approved weld-thru coating or equivalent to all mating surfaces. Refer to Anti-Corrosion Treatment and Repair .
4. Locate reinforcement and body anchor panels. Use 3-dimensional measuring equipment.
5. Plug weld as necessary.
6. Cut and bend each side of the floor panel extension (1).
7. Place the front edge of the extension (2) panel in position.
8. Bring the rear of the service part into place and straighten the bent tabs.
9. Inspect for proper fit and alignment.
10. Weld accordingly, including cuts made for installation.
11. Lower body to frame and reattach body to frame mounts, torque bolts to 85 N·m (63 lb ft).
12. Clean and prepare welded surfaces.
13. Prime with 2-part catalyzed primer. Refer to Basecoat/Clearcoat Paint Systems .



14. Drill appropriate size holes to install 2-part expanding foam in the floor extension (1).
15. Seal holes with a suitable plug (1).
16. Clean and prepare all welded surfaces.
17. Apply the sealers and anti-corrosion materials to the repair area, as necessary. Refer to Anti-Corrosion Treatment and Repair .
18. Paint and repair the area. Refer to Basecoat/Clearcoat Paint Systems .
19. Install all related panels and components.
20. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
21. Enable the SIR system. Refer to SIR Disabling and Enabling .