Hummer H2. Manual - part 988

Fig. 142: Drive Side Heel - Coast Side Heel Contact Pattern 
Courtesy of GENERAL MOTORS CORP. 

Condition 

The backlash is incorrect. The ring gear is too far away from the drive pinion. 

Correction 

Decrease the backlash. Move the ring gear closer to the drive pinion by adjusting the side bearing adjuster 
sleeves. Refer to Backlash Inspection and Adjustment . 

Drive Side Toe - Coast Side Toe Contact Pattern 

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Front Drive Axle - Hummer H2

  

Fig. 143: Drive Side Toe - Coast Side Toe Contact Pattern 
Courtesy of GENERAL MOTORS CORP. 

Condition 

The backlash is incorrect. The ring gear is too close to the drive pinion. 

Correction 

Increase the backlash. Move the ring gear away from the drive pinion by adjusting the side bearing adjuster 
sleeves. Refer to Backlash Inspection and Adjustment . 

DESCRIPTION AND OPERATION 

FRONT DRIVE AXLE DESCRIPTION AND OPERATION 

Full-Time Four Wheel Drive (F4WD) Front Axle Description and Operation 

The Full-Time Four Wheel Drive (F4WD) Front Axle consist of the following components: 

z

Differential Carrier Housing  

z

Differential Assembly  

z

Output Shaft - Left Side  

z

Inner Axle Shaft Housing  

z

Inner Axle Shaft - Right Side  

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Front Drive Axle - Hummer H2

  

The front axle on Full-Time Four Wheel Drive model vehicles does not have a central disconnect feature in 
order to engage and disengage the front axle. The left and right axle shafts are connected directly to the 
differential case assembly. This allows the axle shafts and the propeller shaft to spin continuously. The transfer 
case controls the amount of torque applied to the front axle. A propeller shaft connects the transfer case to the 
front axle. The differential carrier assembly uses a conventional ring and pinion gear set to transmit the driving 
force of the engine to the wheels. The open differential allows the wheels to turn at different rates of speed 
while the axle continues to transmit the driving force. This prevents tire scuffing when going around corners 
and premature wear on internal axle parts. The ring and pinion set and the differential are contained within the 
carrier. The axle identification number is located on top of the differential carrier assembly or on a label on the 
bottom of the right half of differential carrier assembly. The drive axles are completely flexible assemblies 
consisting of inner and outer constant velocity CV joints protected by thermoplastic boots and connected by a 
wheel drive shaft. 

SPECIAL TOOLS AND EQUIPMENT 

SPECIAL TOOLS 

Special Tools 

Illustration

Tool Number/Description

J 2619-01 

Slide Hammer

J 8001 

Dial Indicator Set

J 8092 

Universal Driver Handle - 3/4 in - 10

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Front Drive Axle - Hummer H2

  

J 8614-01 

Flange and Pulley Holding Tool

J 22888-D 

Side Bearing Remover Kit

J 22912-01 

Split-Plate Bearing Remover

J 29369-2 

Bushing and Bearing Remover 2-3 in

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Front Drive Axle - Hummer H2