Sierra 1500 4WD V8-5.3L VIN B HO (2006)
15. If equipped with a 6.0L or 8.1L engine, install the exhaust manifold pipe nuts.
Tighten the nuts to 50 Nm (39 ft. lbs.).
16. Using the transmission jack, raise the transmission.
17. If equipped with a 6.0L or 8.1L engine, and 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.).
18. If equipped with a 6.0L or 8.1L engine, and the exhaust manifold pipe was not replaced perform the following:
0. Connect the oxygen sensor electrical connector.
1. Connect the CPA retainer.
2. Install the clip around the engine harness and the oxygen sensor pigtail.
19. If equipped with a 6.0L or 8.1L engine, remove the exhaust muffler.
20. Install the transmission support crossmember.
21. Install the transmission support crossmember bolts.
Tighten the bolts to 95 Nm (70 ft. lbs.).
