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9K-56 Body Structure:
9. Locate and drill out all factory welds on the rear rail.
Note the number and location of the welds for
installation.
10. Remove the damaged rear rail from the vehicle.
Installation Procedure
NOTE
If the location of the original plug weld holes
can not be determined, space the plug weld
holes every 40 mm (1 1/2 in) apart.
Some panels may have structural weld-thru
adhesive. 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.
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Troubleshooting
