Sierra 3500 4WD V8-6.0L (2008)
10. Remove the exhaust muffler to exhaust manifold pipe nuts (1).
11. Loosen the exhaust muffler clamp (3).
12. Remove the heated oxygen sensor (HO2S). Refer to Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (1500 Series) Heated Oxygen Sensor
Replacement - Bank 2 Sensor 2 (2500 Series) Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (2500 Series - Cab/Chassis) .
13. Lubricate the 4 insulators where the muffler assembly hangers are inserted in order to ease removal.
14. With the aid of an assistant, remove the insulators (1-4) from the front, intermediate, and rear muffler assembly hangers and remove the muffler
assembly.
Installation Procedure
