Sierra 3500 Denali 2WD V8-6.0L (2011)
6. Install the exhaust muffler to exhaust manifold pipe nuts (1) and tighten to 45 Nm (33 lb ft).
7. Install the transmission support crossmember. Refer to Transmission Support Crossmember Replacement (2WD 1500 Series) (See: Body and
Frame/Frame/Cross-Member/Service and Repair/Transmission Support Crossmember Replacement (2WD 1500 Series))Transmission Support
Crossmember Replacement (4WD 1500 Series) (See: Body and Frame/Frame/Cross-Member/Service and Repair/Transmission Support
Crossmember Replacement (4WD 1500 Series))Transmission Support Crossmember Replacement (2WD 2500/3500 Series) (See: Body and
Frame/Frame/Cross-Member/Service and Repair/Transmission Support Crossmember Replacement (2WD 2500/3500 Series))Transmission
Support Crossmember Replacement (4WD 2500/3500 Series) (See: Body and Frame/Frame/Cross-Member/Service and Repair/Transmission
Support Crossmember Replacement (4WD 2500/3500 Series))
8. Remove the support from the transmission.
9. Install the HO2S. Refer to Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (2500 Series - Cab/Chassis) (See: Powertrain
Management/Computers and Control Systems/Oxygen Sensor/Service and Repair)Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (2500
Series) (See: Powertrain Management/Computers and Control Systems/Oxygen Sensor/Service and Repair)Heated Oxygen Sensor Replacement -
Bank 2 Sensor 1 (1500 Series) (See: Powertrain Management/Computers and Control Systems/Oxygen Sensor/Service and Repair).
10. Start the engine and check the front exhaust system for leaks.
