Hummer H3. Manual — part 1026

Fig. 149: View Of Pinion Shaft Lock Bolt
Courtesy of GENERAL MOTORS CORP.

8. Install the pinion shaft lock bolt.

Do not torque the pinion shaft lock bolt at this time.

2007 Hummer H3

2007 Driveline/Axle Rear Drive Axle - H3

Fig. 150: Measuring Backlash Of Pinion Gear Closest To Pinion Shaft Lock Bolt &
Locking Differential Side Gear
Courtesy of GENERAL MOTORS CORP.

9. Measure the backlash of the pinion gear closest to the pinion shaft lock bolt and the locking

differential side gear by doing the following:

1. Rotate the pinion gear so that one of the teeth is perpendicular to the ring gear flange.

2. Install a brass drift between the locking differential side gear and the pinion shaft in

order to prevent the side gear from moving.

3. Install the J 7872 (1) to the ring gear flange. See Special Tools.

4. Loosely clamp the J 7872-2 (2) and the J 8001-3 (3) onto the stem on the J 7872 (1).

See Special Tools.

2007 Hummer H3

2007 Driveline/Axle Rear Drive Axle - H3

5. Install the J 7872-3 (4) to the J 8001-3 (3). See Special Tools.

6. Place the contact pad of the J 7872-3 (4) onto one of the teeth of the pinion gear

closest to the locking differential side gear.

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

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. See

Special Tools.

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:

19.05 mm (0.750 in)

20.32 mm (0.800 in)

21.59 mm (0.850 in)

22.86 mm (0.900 in)

24.13 mm (0.950 in)

25.40 mm (1.000 in)

26.67 mm (1.050 in)

27.94 mm (1.100 in)

29.21 mm (1.150 in)

30.48 mm (1.200 in)

31.75 mm (1.250 in)

2007 Hummer H3

2007 Driveline/Axle Rear Drive Axle - H3

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

6. The locking differential side gear thrust washer

Fig. 151: Identifying 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.

2007 Hummer H3

2007 Driveline/Axle Rear Drive Axle - H3