Installation Procedure

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 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

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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.

CAUTION: Refer to Fastener Caution .

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

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

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Install the exhaust muffler to exhaust manifold pipe nuts (1) and tighten 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 and tighten 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 and tighten 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 (2500 Series - Cab/Chassis) , Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (2500 Series) or Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (1500 Series) .