Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1268 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSCATALYTIC CONVERTER REPLACEMENT (6.6L)INSTALLATION PROCEDURE

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2

Installation Procedure

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Installation Procedure

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: View Of Turbocharger Exhaust Pipe & Clamps

Courtesy of GENERAL MOTORS CORP.

Apply water based lubricant to the exhaust pipe hanger bracket, in order to aid in installation.
Install the catalytic converter.
Slide the down turbocharger exhaust pipe to catalytic converter clamp.

NOTE: Refer to Fastener Notice .

Tighten the turbocharger exhaust pipe to catalytic converter clamp.
Tighten: Tighten the clamp to 12 N.m (106 lb in).

Fig 2: View Of Catalytic Converter, Particulate Filter & Nuts

Courtesy of GENERAL MOTORS CORP.

Install the catalytic converter to particulate filter nuts.
Tighten: Tighten the nuts to 45 N.m (33 lb ft).

Fig 3: Transmission Support Crossmember (6.0L, 6.6L, and 8.1L Engines)

Courtesy of GENERAL MOTORS CORP.

Install the transmission support crossmember.
Install the transmission support crossmember bolts.
Tighten: Tighten the bolts to 95 N.m (70 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.

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.