Hummer H2. Manual - part 1903

5. Install the catalytic converter to muffler flange nuts. 

Tighten: Tighten the nuts to 48 N.m (35 lb ft). 

Fig. 32: View Of Transmission 
Courtesy of GENERAL MOTORS CORP. 

6. Connect the oxygen sensor electrical connectors (1, 2).  

7. Connect the CPA retainers. 

 

2004 Hummer H2 

2004 ENGINE Engine Exhaust - Hummer H2

  

Fig. 33: Installing Catalytic Converter Guard 
Courtesy of GENERAL MOTORS CORP. 

8. Install the catalytic converter guard. Refer to Catalytic Converter Guard Replacement in Frame and 

Underbody.  

9. Lower the vehicle.  

MUFFLER REPLACEMENT 

Tools Required 

J 38185 Hose Clamp Pliers 

Removal Procedure 

1. Deflate the rear suspension air bags, if equipped. Refer to Air Suspension Depressurization Procedure 

in Air Suspension.  

2. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information. 

 

2004 Hummer H2 

2004 ENGINE Engine Exhaust - Hummer H2

  

Fig. 34: Exhaust Muffler Nuts 
Courtesy of GENERAL MOTORS CORP. 

3. Remove the exhaust muffler to catalytic converter flange nuts.  

4. Loosen the exhaust pipe clamp.  

5. Support the rear axle with jack stands.  

6. Remove the right side lower stabilizer nut and position link aside.  

7. Remove the rear track bar right hand nut and bolt.  

8. Remove the right hand rear shock lower bolt and nut.  

9. Disconnect the right hand air suspension level sensor, if equipped. Refer to Air Spring Leveling Sensor 

Replacement in Air Suspension.  

10. Lower the axle. 

 

2004 Hummer H2 

2004 ENGINE Engine Exhaust - Hummer H2

  

Fig. 35: Insulators & Muffler Hangers 
Courtesy of GENERAL MOTORS CORP. 

11. Remove the insulators from the frame hangers.  

12. With the aid of an assistant, slide the muffler rearward in order to remove the muffler from the catalytic 

converter.  

13. Remove the insulators from the muffler hangers.  

14. Remove the muffler from the vehicle.  

Installation Procedure 

 

2004 Hummer H2 

2004 ENGINE Engine Exhaust - Hummer H2