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

1. Disable the Supplemental Inflatable Restraint (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.
4. Repair as much of the damage as possible to factory specifications. Refer to Dimensions - Body .
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: Do not damage any inner panels or reinforcements.




6. To remove the rear rail assembly, the rear spring seats, #4, #5, #6, and #7 cross bars, including the floor extensions will have to be removed to gain access to the rail spot welds.



7. Locate and drill out all factory welds. Note the number and location of the welds for installation of the rear rail.



8. Remove the damaged rear rail.

Important: 

•	If the location of the original plug weld holes cannot be determined, space the plug weld holes every 40 mm (1 ½ in) apart.

•	Some panels may have structural weld-thru adhesive. It is necessary to replace the weld-thru adhesive with an additional spot weld between each factory spot weld.




1. Drill 8 mm (5/16 in) plug weld holes in the service part as necessary in the locations noted from the original panel.
2. 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. Position the rear rail lower to the vehicle using 3-dimensional measuring equipment. Clamp the rear rail lower into place.



5. Plug weld accordingly.
6. Clean and prepare all welded surfaces.
7. Apply the sealers and anti-corrosion materials to the repair area, as necessary. Refer to Anti-Corrosion Treatment and Repair .
8. Paint the repair area. Refer to Basecoat/Clearcoat Paint Systems .
9. Install all related panels and components.
10. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
11. Enable the SIR system. Refer to SIR Disabling and Enabling .