Important: Sectioning the outer rocker panel requires a 100 mm (4 in) backing plate for reinforcement (1). There are key structural areas on the outer rocker panel where sectioning should not be performed. Sectioning in these areas may compromise the structural integrity of the vehicle.

Sectioning of the inner reinforcement panel can only take place with the outer door frame replacement or sectioning procedures. Sectioning of the outer door frame at the front door frame at the front hinge pillar requires a 40 mm (1½ in) offset from the inner reinforcement sectioning joint. The inner reinforcement can serve as a backing plate for the outer panel sectioning.

1. Remove all related panels and components including the front door.
2. Position all wiring out of the way to prevent damage.
3. Remove sealers and anti-corrosion materials as necessary.



4. On the original outer door frame (1) measure down from the large wiring harness hole in the pillar 50 mm (2 in) and mark a horizontal line.
5. Cut the outer door frame along this line for sectioning.
6. Perform additional sectioning procedures as necessary to remove damaged areas of the door frame opening.
7. Locate, mark, and drill out all necessary factory welds. Note the number and location of welds for installation of the service panel (2).
8. Remove the damaged section of the door frame opening.

1. On the service part (2), mark a horizontal line to leave a gap of one and one-half times the thickness of the metal at the section joint.
2. Cut the service panel along this line.
3. Drill 8 mm (5/16 in) holes for plug welding in the service part in the locations noted from the original panel.



4. Also, drill holes for plug welding along the sectioning cut on the service part.
5. Locate these holes approximately 13 mm (½ in) from the edge of the sectioning cut.
6. Use the inner reinforcement (3) as a backing plate.
7. Stitch weld along the entire joint.
8. Make 25 mm (1 in) gaps between stitch welds.
9. Go back and complete the stitch weld. This will create a solid joint with minimal heat distortion.
10. Complete all other welds and sectioning procedures as necessary.
11. Clean and prepare welded surfaces.
12. Prime with two-part catalyzed primer.
13. Apply sealers and anti-corrosion materials as necessary.

Important: Prior to refinishing, refer to GM 4901MD-99 Refinish Manual for recommended products. Do not combine paint systems. Refer to paint manufacturers recommendations.

14. Install all related panels and components.