Chevrolet Silverado / GMC Sierra. Manual - part 1270

1. Disable the SIR system. Refer to SIR Disabling and Enabling .  

2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection 

(w/Single Battery) or Battery Negative Cable Disconnection and Connection (w/Auxiliary Battery) 
or Battery Negative Cable Disconnection and Connection (w/Dual Batteries) .  

3. Remove all of the related panels and components. 

CAUTION: Refer to Approved Equipment for Collision Repair Caution .

CAUTION: Refer to Collision Sectioning Caution .

IMPORTANT: Perform all of the steps on both of the rails for complete module 

replacement.

 

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. 6: Frame Measurements 
Courtesy of GENERAL MOTORS CORP. 

4. Locate and mark the sectioning location by using at least 2 of the measurements below for each frame 

rail: 



Top of the frame rail edge rearward 420 mm (16 1/2 in) (with bumper bracket removed)  



Bottom of the frame rail edge rearward 387 mm (15 3/16 in) (with bumper bracket removed)  



Front edge of the gage hole forward 22 mm (7/8 in)  



Center of the gage hole forward 33 mm (1 1/4)  



Rear edge of the gage hole forward 47 mm (1 7/8 in) 

 

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 7 

© 2005 Mitchell Repair Information Company, LLC. 

Fig. 7: Marking Sectioning Location With Masking Tape 
Courtesy of GENERAL MOTORS CORP. 

5. Apply masking tape completely around the frame rail next to the sectioning location as shown. 

IMPORTANT: Line up the masking tape with the tape edge facing the front of the vehicle 

on the sectioning location.

 

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 8 

© 2005 Mitchell Repair Information Company, LLC. 

Fig. 8: Cutting Frame Rail With Reciprocating Saw 
Courtesy of GENERAL MOTORS CORP. 

6. Cut each frame rail at the front edge of the tape line using a reciprocating saw or equivalent, as shown. 

IMPORTANT: The tape edge facing the front of the vehicle is the proper cut location.

 

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 9 

© 2005 Mitchell Repair Information Company, LLC.