Installation Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Catalytic Converter (6.6L Engine)

Courtesy of GENERAL MOTORS CORP.

If equipped with a 6.6L engine, install the catalytic converter.
Apply water based lubricant to the exhaust pipe hanger bracket, in order to aid in installation.
Slide the catalytic converter hanger into the exhaust pipe hanger bracket.

Fig 2: Exhaust Muffler Nuts (6.0L, 6.6L, and 8.1L Engines)

Courtesy of GENERAL MOTORS CORP.

If equipped with the 6.6L engine, install the exhaust muffler nuts until snug.

Fig 3: View Of Turbocharger Exhaust Pipe & Clamp

Courtesy of GENERAL MOTORS CORP.

IMPORTANT: Ensure that the manifold pipe is square to the exhaust pipe adapter.

NOTE: Refer to Fastener Notice in Cautions and Notices.

If equipped with a 6.6L engine, slide the exhaust pipe clamp down and around the pipe connection.
Tighten the exhaust pipe clamp and muffler nuts.
Tighten:
- Tighten the clamp to 40 N.m (30 lb ft).
- Tighten the nuts to 40 N.m (30 lb ft).

Fig 4: Identifying Transmission Mount Nuts

Courtesy of GENERAL MOTORS CORP.

Lower the transmission onto the transmission support.
Install the transmission mount to transmission support nuts.
Tighten: Tighten the bolts to 40 N.m (30 lb ft).
Remove the support from the transmission.
Lower the vehicle.