Catalytic Converter: Removal & Installation (5.3L & 6.0L Engines) - Chevrolet Trailblazer Service Manual

To Install:
1. Install the exhaust hanger onto the catalytic converter pipe.
2. Place the catalytic converter into the vehicle.
3. Install the transmission mount onto the frame.
4. Attach the catalytic converter to the muffler. Torque the bolts evenly to 33 ft-lb (45
Nm).
5. Place a new seal on the catalytic converter.
6. Attach the catalytic converter to the exhaust manifold. Torque the bolts to 37 ft-lb
(50 Nm).
7. Install the heated oxygen sensor (HO2S) into the catalytic converter.
8. Lower the vehicle.
5.3L & 6.0L Engines
To Remove:
1. Lift the vehicle.
2. Remove the heated oxygen sensors (HO2S) from the catalytic converter.
3. Remove the rear propeller shaft from the vehicle.
4. For vehicles with 4WD, remove the front propeller shaft from the vehicle.
5. Use a jack to support the transmission.
6. Remove the transmission support from the frame.
Muffler removal and installation