GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2003 🢒 Regal 🢒 Body and Accessories 🢒 Collision Repair 🢒 Rear Floor Replacement

Removal Procedure

    Important: The damaged floor is cut along the rearward edge of the rear crossbar, and the service part is cut so that the new floor section extends to the front edge of the rear crossbar. This allows the two sections to overlap where the crossbar is attached. The service part is supplied cut to length. The cut will be about 865 mm (34 5/8 in) from the rear edge of the panel (1).


    Object Number: 314855 Size: SH
  1. Remove all related panels and components, including the following:
    2. • Rear end panel
    • Quarter panels
    • Quarter panel extensions as necessary
  2. Visually inspect and restore as much of the damage as possible.
  3. Remove the following as necessary:
    4. • Sealers
    • Sound deadening materials
    • Anti-corrosion materials
  4. Locate, mark and drill out all factory welds rearward of the rear crossbar including those along the lower edge of the wheelhouse. Note the number and location of weld for installation of the floor service assembly.

    5. Important: Only drill out the factory welds rearward of the crossbar. Do not drill out the welds attaching the floor to the crossbar.

  5. Cut the damaged floor along the rear edge of the crossbar.
  6. Remove the damaged floor section. Take care not to damage the following:
    7. • Rear rails
    • Crossbar
    • Wheelhouse
  7. Remove the damaged floor section.

Installation Procedure

    Object Number: 314857 Size: SH
  1. Prepare mating surfaces.
  2. Check for proper fit.
  3. Allow the floor service assembly (1) to overlap the original floor on top of the rear crossbar  (2).
  4. Mark the location of the rear rail and crossbar flanges on the bottom of the floor service assembly.
  5. Drill 8 mm (5/16 in) plug weld as necessary in the locations noted from the original floor (3).
  6. Drill weld holes approximately 40 mm (1½ in) apart where the new floor section attaches to the rear rail and crossbar flanges.
  7. Position the service assembly and check for proper fit.
  8. Plug weld accordingly.
  9. Clean and prepare all welded surfaces.
  10. Prime with 2-part catalyzed primer.
  11. Apply the following as necessary:

    12.    Important: The rear crossbar areas must be properly sealed from moisture and dirt to seal both the front and rear edges of the crossbar as well as the inner seams.

    • Sealers
    • Sound deadening materials
    • Anti-corrosion materials

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

  12. Install all related panels and components.