Hummer H2. Manual - part 897

locking differential side gear. 

Preload the dial of the J 8001-3 approximately 3/4 of a turn clockwise. 

7. Tighten the lock nut of the J 7872-2 (2) finger tight.  

8. Turn the dial of the J 8001-3 until the needle and the dial face indicate ZERO.  

9. Pull the pinion gear firmly into the differential case seat.  

10. Rotate the pinion gear back and forth.  

11. Measure the backlash. 

Specification: The backlash between the locking differential side gear and the pinion gears should 
be 0.051-0.076 mm (0.002-0.003 in). 

10. If the backlash is too large, disassemble the differential, install the next larger size side gear thrust 

washer, re-assemble the differential and recheck the backlash.  

11. If the backlash is too small, disassemble the differential, install next smaller size side gear thrust washer, 

re-assemble the differential and recheck the backlash.  

Locking differential side gear thrust washers are available in the following sizes: 

Washer Sizes:  

z

19.05 mm (0.750 in)  

z

20.32 mm (0.800 in)  

z

21.59 mm (0.850 in)  

z

22.86 mm (0.900 in)  

z

24.13 mm (0.950 in)  

z

25.40 mm (1.000 in)  

z

26.67 mm (1.050 in)  

z

27.94 mm (1.100 in)  

z

29.21 mm (1.150 in)  

z

30.48 mm (1.200 in)  

z

31.75 mm (1.250 in)  

Differential Side Gear Backlash Adjustment 

1. Remove the following from the differential case: 

1. The pinion shaft lock bolt  

2. The pinion shaft  

3. The pinion gears  

4. The pinion gear thrust washers  

5. The locking differential side gear 

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Drive Axle - Locking/Limited Slip - Hummer H2

  

6. The locking differential side gear thrust washer  

Fig. 27: Differential Side Gears & Thrust Washers 
Courtesy of GENERAL MOTORS CORP. 

2. Install the differential side gear thrust washer into the bell-end of the differential case.  

3. Install the differential side gear into the bell-end of the differential case. 

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Drive Axle - Locking/Limited Slip - Hummer H2

  

Fig. 28: Differential Pinion Gears & Thrust Washers 
Courtesy of GENERAL MOTORS CORP. 

4. Install the differential pinion gears by doing the following: 

1. Position both pinion gears and each thrust washer into each side of the differential window. 

Place the pinion gears 180 degrees across from each other. 

2. Rotate the differential side gears until both pinion gears are directly opposite the opening in the 

differential case. 

Line up the pinion shaft opening in each of the pinion gears with the pinion shaft opening in the 
differential case. 

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Drive Axle - Locking/Limited Slip - Hummer H2

  

Fig. 29: Pinion Gear Shaft 
Courtesy of GENERAL MOTORS CORP. 

5. Install the pinion shaft.  

6. If the pinion shaft cannot be installed, remove the pinion gears and thrust washers, the locking differential 

side gear and differential thrust washer.  

7. Install a smaller differential side thrust washer and re-install the locking differential side gear, the pinion 

gears and thrust washers and the pinion shaft. 

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Drive Axle - Locking/Limited Slip - Hummer H2