Installation Procedure

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Install the exhaust manifold pipe bracket.
NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
If equipped with a 6.6L or 8.1L engine and a 6-speed manual transmission, install the exhaust pipe hanger bracket bolts.
Tighten

Tighten the bolts to 12 N.m (106 lb in).

Fig 1: Installing Exhaust Pipe Hanger Bracket Bolts (6.6L & 8.1L w/6-Speed Manual Transmission)
Courtesy of GENERAL MOTORS CORP.
If equipped with a 6.6L or 8.1L engine and a Allison transmission, install the exhaust pipe hanger bracket bolts.
Tighten

Tighten the bolts to 12 N.m (106 lb in).

Fig 2: Installing Exhaust Pipe Hanger Bracket Bolts (6.6L & 8.1L w/Allison Transmission)
Courtesy of GENERAL MOTORS CORP.
If equipped with a 6.0L engine and a 5-speed manual transmission, install the exhaust pipe hanger bracket bolts.
Tighten

Tighten the bolts to 12 N.m (106 lb in).

Fig 3: Installing Exhaust Pipe Hanger Bracket Bolts (6.0L w/5-Speed Manual Transmission)
Courtesy of GENERAL MOTORS CORP.
If equipped with a 6.0L engine and a 5-speed manual transmission, install the transmission bolts.
Tighten

Tighten the bolts to 100 N.m (74 lb ft).

Fig 4: Installing Transmission Bolts (6.0L w/5-Speed Manual Transmission)
Courtesy of GENERAL MOTORS CORP.
If equipped with a 6.0L or 8.1L engine and a 4L80-E automatic transmission, install the exhaust pipe hanger bracket bolts.
Tighten

Tighten the bolts to 12 N.m (106 lb in).

Fig 5: Installing Exhaust Pipe Hanger Bracket Bolts (6.0L & 8.1L w/4L80-E Transmission)
Courtesy of GENERAL MOTORS CORP.
If equipped with a 6.0L engine and a 4L80-E automatic transmission, install the exhaust pipe hanger bracket bolts.
Tighten

Tighten the bolts to 12 N.m (106 lb in).

Fig 6: Installing Exhaust Pipe Hanger Bracket Bolts (6.0L w/4L80-E Transmission)
Courtesy of GENERAL MOTORS CORP.
If equipped with a 4L60-E automatic transmission, install the exhaust pipe hanger bracket bolts.
Tighten

Tighten the bolts to 17 N.m (13 lb ft).
Install the catalytic converter. Refer to Catalytic Converter Replacement (4.3L, 4.8L, and 5.3L Engines) or Catalytic Converter Replacement (6.0L and 8.1L Engines) .
Install the exhaust manifold pipe. Refer to Exhaust Manifold Pipe Replacement (6.0, 6.6, and 8.1L Engines) .

Fig 7: Installing Exhaust Pipe Hanger Bracket Bolts (w/4L60-E Transmission)
Courtesy of GENERAL MOTORS CORP.