Chevrolet Silverado / GMC Sierra. Service manual — part 1294
Fig. 92: Creating Backing Plate
Courtesy of GENERAL MOTORS CORP.
2. Create a 50 mm (2 in) (1) backing plate from the unused portion of the service part. Trim the backing
plate as necessary to fit behind the sectioning joint where there is no reinforcement.
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Collision Repair - - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Fig. 93: Drilling Plug Weld Holes
Courtesy of GENERAL MOTORS CORP.
3. Drill 8 mm (5/16 in) plug weld holes along the sectioning cut on the remaining original part (2). Locate
these holes approximately 13 mm (1/2 in) from the edge (1) and spaced 40 mm (1 1/2 in) apart.
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Collision Repair - - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Fig. 94: Drilling Plug Weld Holes
Courtesy of GENERAL MOTORS CORP.
4. Drill 8 mm (5/16 in) plug weld holes in the service part as necessary in the locations noted from the
original panel and along the sectioning cut.
IMPORTANT: If the location of the original plug weld holes cannot be determined, space
the plug weld holes every 40 mm (1 1/2 in) apart.
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Collision Repair - - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Fig. 95: Plug Weld Holes & Welding Backing Plate
Courtesy of GENERAL MOTORS CORP.
5. Prepare all attachment surfaces, as necessary.
6. Apply GM-approved Weld-Thru Coating or equivalent to all mating surfaces. Refer to Anti-Corrosion
Treatment and Repair .
7. Fit the backing plate (3) halfway into the sectioning joint, clamp and plug weld to the vehicle.
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Collision Repair - - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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