Removal Procedure

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: View Of Catalytic Converter To Muffler Nuts

Courtesy of GENERAL MOTORS CORP.

Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle .
Lower the spare tire.
Remove the catalytic converter to exhaust muffler nuts.

Fig 2: View Of Rear Muffler Assembly Insulators

Courtesy of GENERAL MOTORS CORP.

If equipped with a 4.8L engine, perform the following steps, otherwise proceed to step 7.
Lubricate the 3 insulators where the muffler assembly hangers are inserted in order to ease removal.
With the aid of an assistant, remove the insulators (1, 2) from the front and rear muffler assembly hangers.

Fig 3: View Of Intermediate Muffler Assembly Insulator

Courtesy of GENERAL MOTORS CORP.

Remove the insulator (1) from the intermediate muffler assembly hanger and remove the muffler assembly.

Fig 4: View Of Front & Rear Muffler Assembly Insulators

Courtesy of GENERAL MOTORS CORP.

If equipped with a 5.3L, or a 6.0L engine, perform the following steps.
Lubricate the 3 insulators where the muffler assembly hangers are inserted in order to ease removal.
With the aid of an assistant, remove the insulators (1, 2) from the front and rear muffler assembly hangers.

Fig 5: View Of Intermediate Muffler Assembly Insulators

Courtesy of GENERAL MOTORS CORP.

NOTE: During removal or installation, do not over extend the flex couple as internal damage may occur.

Remove the insulators (1) from the intermediate muffler assembly hangers and remove the muffler assembly. Pull the muffler assembly rearward until the flange is able to clear the front frame crossmember, and remove the muffler toward the front of the vehicle.