Chevrolet Silverado / GMC Sierra. Service manual — part 1837

Tighten: Tighten the bolts to 25 N.m (18 lb ft).

Fig. 168: View Of RPO MW7 Exhaust Pipe Hanger Bracket, Bolts & Studs
Courtesy of GENERAL MOTORS CORP.

2. If equipped with a Allison® automatic transmission, RPO MW7, install the exhaust pipe

hanger bracket and bolt/stud.

Tighten: Tighten the bolt/stud to 25 N.m (18 lb ft).

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Exhaust - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 169: View Of Exhaust Pipe Hanger Bracket & Bolts
Courtesy of GENERAL MOTORS CORP.

3. If equipped with a 4L80-E automatic transmission, RPO MT1, install the exhaust pipe

hanger bracket and bolts.

Tighten: Tighten the bolts to 25 N.m (18 lb ft).

4. If equipped with a 6.6L engine, install the catalytic converter. Refer to Catalytic

Converter Replacement (4.3L) or Catalytic Converter Replacement (4.8L, 5.3L, 6.0L,
6.2L) or Catalytic Converter Replacement (6.6L).

5. If equipped with a 6.0L engine, install the left catalytic converter. Refer to Catalytic

Converter Replacement - Left Side (6.0L - Cab/Chassis).

6. If equipped with a 6.0L engine, install the exhaust manifold pipe. Refer to Exhaust

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Exhaust - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Manifold Pipe Replacement (6.0L - Cab/Chassis).

MUFFLER REPLACEMENT (1500 SERIES W/4.3L, 4.8L, 5.3L, 6.0L)

Removal Procedure

Fig. 170: View Of Catalytic Converter To Muffler Nuts
Courtesy of GENERAL MOTORS CORP.

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

2. Lower the spare tire.

3. Remove the catalytic converter to exhaust muffler nuts.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Exhaust - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 171: View Of Rear Muffler Assembly Insulators
Courtesy of GENERAL MOTORS CORP.

4. If equipped with a 4.8L engine, perform the following steps, otherwise proceed to step 7.

5. Lubricate the 3 insulators where the muffler assembly hangers are inserted in order to ease

removal.

6. With the aid of an assistant, remove the insulators (1, 2) from the front and rear muffler

assembly hangers.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Exhaust - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado