Sierra 3500 Denali 2WD V8-6.0L (2011)
9. If equipped with a 5.3L, or a 6.0L engine, lubricate the 3 insulators where the muffler assembly hangers are inserted in order to ease removal.
10. With the aid of an assistant, remove the insulators (1, 2) from the front and rear muffler assembly hangers.
Caution: During removal or installation, do not over extend the flex couple as internal damage may occur.
11. 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.
Installation Procedure
