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 Exhaust Manifold Pipe

Courtesy of GENERAL MOTORS CORP.

Install a NEW exhaust manifold pipe gasket onto the muffler studs.
Install the exhaust manifold pipe.

Fig 2: View Of Exhaust Manifold Pipe, Gasket, Bolt & Manifold

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Install any necessary exhaust muffler insulators that were separated from the muffler.
Using the transmission jack, raise the transmission slightly.

NOTE: Refer to Fastener Notice .

Install the exhaust manifold pipe to exhaust manifold nuts.
Tighten: Tighten the nuts to 50 N.m (37 lb ft).

Fig 3: View Of Exhaust Muffler, Exhaust Manifold Pipe, Gasket & Nuts

Courtesy of GENERAL MOTORS CORP.

Install the exhaust muffler to exhaust manifold pipe nuts (1).
Tighten: Tighten the nuts to 45 N.m (33 lb ft).

Fig 4: View Of Transmission Support Crossmember & Bolts

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Position the transmission support crossmember.
Install the transmission support crossmember bolts.
Tighten: Tighten the bolts to 95 N.m (70 lb ft).

Fig 5: Identifying Transmission Mount Nuts

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Using the transmission jack, lower the transmission onto the transmission support.
Install the transmission mount to transmission support nuts.
Tighten: Tighten the nuts to 40 N.m (30 lb ft).
Remove the support from the transmission.
Install the HO2S. Refer to Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (1500 Series) or Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (2500 Series) or Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (2500 Series - Cab/Chassis) .