Sierra Classic 3500 4WD V8-8.1L (2007)
7. If equipped with a 6.0L engine and a 4L80-E automatic transmission, install the exhaust pipe hanger bracket bolts.
Tighten the bolts to 12 Nm (106 inch lbs.).
8. If equipped with a 4L60-E automatic transmission, install the exhaust pipe hanger bracket bolts.
Tighten the bolts to 17 Nm (13 ft. lbs.).
9. Install the catalytic converter.
10. Install the exhaust manifold pipe.
