Chevrolet Silverado / GMC Sierra. Manual — part 1274
Fig. 19: View Of 50 mm Backing Plate
Courtesy of GENERAL MOTORS CORP.
2. Create a 50 mm (2 in) backing plate from the unused portion of the service part. Trim the backing plate as
necessary to fit behind the sectioning joint.
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Collision Repair - - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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Fig. 20: Drilling 8 mm 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. Locate these
holes approximately 25 mm (1 in) (a) from the edge 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
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Friday, August 21, 2009 2:20:59 PM
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© 2005 Mitchell Repair Information Company, LLC.
Fig. 21: Drilling Windshield Frame Pillar 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 can not be determined, or if
structural weld-thru adhesive was present, 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
Microsoft
Friday, August 21, 2009 2:20:59 PM
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© 2005 Mitchell Repair Information Company, LLC.
Fig. 22: Plug 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 (2) halfway into the sectioning joint, clamp and plug weld to the vehicle (3).
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Collision Repair - - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Microsoft
Friday, August 21, 2009 2:20:59 PM
Page 25
© 2005 Mitchell Repair Information Company, LLC.
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