Chevrolet Silverado / GMC Sierra. Service manual — part 2267

TRANSMISSION SUPPORT CROSSMEMBER REPLACEMENT (4WD 2500 HD/3500)

1

Transmission Mount to Crossmember Nut (Qty: 2)

Tighten: 40 N.m (30 lb ft)

NOTE:

Refer to Fastener Notice .

2

Transmission Crossmember Nut (Qty: 4)

Tighten: 97 N.m (70 lb ft)

3

Transmission Crossmember Bolt (Qty: 4)
Tip:

1. Remove all traces of the original adhesive patch.

2. Clean the threads of the bolt with denatured alcohol or equivalent and

allow to dry.

3. Apply threadlocker GM P/N 12345493 (Canadian P/N 10953488).

4

Transmission Crossmember

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Frame and Underbody - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra

& Silverado

Fig. 13: Transmission Support Crossmember (4WD 2500 HD/3500)
Courtesy of GENERAL MOTORS CORP.

FRAME CUSHION OR INSULATOR REPLACEMENT (EXTENDED CAB)

Removal Procedure

1. Remove the master cylinder. Perform the following steps:

1. Remove the nuts retaining the master cylinder to the brake booster.

2. Remove the master cylinder from the brake booster.

3. Secure the cylinder away from the booster.

2. Raise the vehicle on the hoist. Refer to Lifting and Jacking the Vehicle .

3. Remove the park brake equalizer intermediate cable. Perform the following steps:

Callout

Component Name

Preliminary Procedures

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .

2. Support the transmission with a transmission jack.

1

Transmission Mount to Crossmember Nut (Qty: 2)

Tighten: 40 N.m (30 lb ft)

NOTE:

Refer to Fastener Notice .

2

Transmission Crossmember Nut (Qty: 4)

Tighten: 97 N.m (70 lb ft)

3

Transmission Crossmember Bolt (Qty: 4)
Tip:

1. Remove all traces of the original adhesive patch.

2. Clean the threads of the bolt with denatured alcohol or equivalent and

allow to dry.

3. Apply threadlocker GM P/N 12345493 (Canadian P/N 10953488).

4

Transmission Crossmember

IMPORTANT: Ensure that the vehicle is unloaded prior to body removal.

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Frame and Underbody - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra

& Silverado

1. Remove the nut from the park brake equalizer intermediate cable.

2. Remove the intermediate cable from the equalizer.

3. Depress the retaining tabs that secure the park brake cable to the frame.

4. Pull slightly on the cable from the mounting area in order to provide slack for body

movement without binding the cable.

Fig. 14: View Of Frame Cushion (Extended Cab)
Courtesy of GENERAL MOTORS CORP.

4. Remove the body mount bolts.

5. Properly support the body in the area that the mounts will be replaced.

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Frame and Underbody - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra

& Silverado

6. Lower the chassis accordingly in order to remove the cushions (1) as necessary.

Installation Procedure

CAUTION: When you remove the body cushions, do NOT separate

the frame from the body more than is necessary. Possible
personal injury and damage to multiple parts may result if
you do not follow the guides outlined below:

Intermediate steering shaft-Do not allow the shaft to
extend more than 25 mm (1 in).

Fuel tank filler hose-Do not stretch the hose
excessively.

Tail/Turn signal lamp wiring/rear lamps junction
block-Leave slack in the wires.

Park brake cable-Leave slack in the cable.

Body ground straps-Leave slack in the wire.

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Frame and Underbody - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra

& Silverado