Sierra Classic 3500 4WD V8-8.1L (2007)
11. If the exhaust manifold pipe was replaced perform the following:
1. Apply anti-seize compound GM P/N 12377953 or equivalent to the threads of the old oxygen sensor.
2. Install the old oxygen sensor.
Tighten the sensor to 42 Nm (31 ft. lbs.).
12. If the exhaust manifold pipe was not replaced perform the following:
1. Connect the oxygen sensor electrical connector.
2. Connect the CPA retainer.
3. Install the clip around the engine harness and the oxygen sensor pigtail.
13. Install the exhaust pipe/catalytic converter to the vehicle.
14. Install the exhaust system hangers.
15. Depending on which side is being replaced, perform one of the following steps:
^
Install the exhaust muffler nuts.
Tighten the nuts to 40 Nm (30 ft. lbs.).
or
^
Install a NEW exhaust pipe clamp.
Tighten the clamp to 44 Nm (33 ft. lbs.).
16. Install the transmission support crossmember.
17. Install the transmission support crossmember bolts.
Tighten the bolts to 95 Nm (70 ft. lbs.).
