Hummer H2. Manual - part 2754

10. Replace the planetary differential if any of the above conditions are found.  

11. Inspect the thrust washers for excessive wear or scoring.  

12. Replace the thrust washers if they are faulty.  

Sun Gears and Lock-Up Hub 

Fig. 60: Identifying Front Sun Gear, Rear Sun Gear & Inner Lockup Hub 
Courtesy of GENERAL MOTORS CORP. 

1. Clean the front sun gear (1), the rear sun gear (2), and the inner lockup hub (3) in cleaning solvent and air 

dry.  

2. Inspect the teeth on the front sun gear (1), the rear sun gear (2), and the inner lockup hub (3) for the 

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Transfer Case - Overhaul - BW 4482-NR4

  

following conditions: 

z

Chipped teeth  

z

Excessively worn gear surfaces 

Slight wear marks are normal. 

z

Debris embedded in the root of the teeth  

3. Inspect the thrust washer surfaces for excessive wear or scoring.  

4. Replace the front sun gear (1), the rear sun gear (2), and the inner lockup hub (3) if they are faulty.  

Lock-Up Shift Assembly 

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Transfer Case - Overhaul - BW 4482-NR4

  

Fig. 61: Illustrating Lockup Shift Assembly Components 
Courtesy of GENERAL MOTORS CORP. 

1. If necessary, disassemble the lockup shift assembly. Refer to Transfer Case Disassemble and Transfer 

Case Assemble .  

2. Clean the lockup shift assembly components in cleaning solvent and air dry.  

3. Inspect the lockup shift hub engagement teeth for the following conditions: 

z

Chipped teeth  

z

Excessively worn gear surfaces 

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Transfer Case - Overhaul - BW 4482-NR4

  

Slight wear marks are normal. 

z

Debris embedded in the root of the teeth  

4. Replace the lockup shift assembly if it is faulty. The lockup shift assembly components are not serviced 

separately.  

Drive Chain and Sprockets 

Fig. 62: View Of Drive Chain, Drive Sprocket & Driven Sprocket 
Courtesy of GENERAL MOTORS CORP. 

1. Clean the drive chain (1), drive sprocket (2), and driven sprocket (3) in cleaning solvent and air dry.  

2. Inspect the drive chain (1) for the following conditions: 

z

Loose link pins  

z

Binding or stiff links  

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Transfer Case - Overhaul - BW 4482-NR4