Chevrolet Silverado / GMC Sierra. Service 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

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

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

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