Hummer H3. Manual — part 1016

Specification: The rotating torque of the drive pinion should be 1.7-3.4 N.m (15-30 lb in)
for new bearings or 1.1-2.3 N.m (10-20 lb in) for used bearings.

3. If the rotating torque for the drive pinion bearings is not within specifications, adjust as

necessary. Refer to Drive Pinion and Ring Gear Replacement.

4. Install the differential assembly with the differential side bearings and differential side

bearing cups into the axle housing.

5. Insert one 4.318 mm (0.170 in) thick service spacer into the left side of the axle housing.

6. Side the differential assembly towards the service spacer in order to hold the spacer in

place.

7. Install the J 22779 into the right side of the axle housing.

The J 22779 must be installed between the service spacer and the differential side bearing
cup.

8. Tighten the knob on the J 22779 until there is moderate drag when the J 22779 is moved.

9. Remove the J 22779 .

10. Remove the service spacer.

11. Using a micrometer, measure the thickness of the service spacer. Record the measurement.

12. Using a micrometer, measure the thickness of the J 22779 in 3 locations. Calculate the

average of the 3 measurements. Record the measurement.

13. Add the thickness of the service spacer, measured in Step 11 to the average thickness of the

J 22779 , measured in Step 12. The resulting value is the total service shim thickness
without preload for the axle.

14. Insert one BENT 1.016 mm (0.040 in) service shim between the right side differential side

bearing cup and the axle housing. The service shim must be installed between the service
spacer and the differential side bearing cup.

IMPORTANT: Before installation of the differential assembly, ensure that

the differential side bearing surfaces in the axle housing are
clean and free of burrs. If the original differential side
bearings are to be reused, the original differential side
bearing cups must also be used.

IMPORTANT: Over-tightening of the J 22779 may spread the housing and

result in incorrect shim selection.

2007 Hummer H3

2007 Driveline/Axle Rear Drive Axle - H3

15. Install the J 22779 into the left side of the axle housing. The J 22779 must be installed

between the service spacer and the differential side bearing cup.

16. While rotating the ring gear back and forth, tighten the knob on the J 22779 until there is

approximately 0.025-0.051 mm (0.001-0.002 in) of backlash between the ring gear and the
drive pinion.

17. Once the correct amount of backlash is obtained, remove the J 22779 .

18. Remove the differential assembly with the differential side bearings and the differential side

bearing cups.

19. Remove the BENT service shim.

20. Using a micrometer, measure the thickness of the J 22779 in 3 locations. Calculate the

average of the 3 measurements. This value is the left side service shim thickness without
preload.

21. In order to determine the right side service shim thickness, subtract the service shim

thickness for the left side of the axle, calculated in step 20, from the total service shim
thickness, calculated in step 13. This value is the service shim thickness for the right side of
the axle without preload.

22. In order to preload of the differential side bearings and set the backlash to approximately

0.127-0.223 mm (0.005-0.009 in), take the value determined in step 21 and add 0.203 mm
(0.008 in) service shim thickness to this amount.

23. Assemble the left side shim pack using one 4.318 mm (0.170 in) service spacer and the

appropriate amount of service shims equaling the thickness determined in step 20. Measure
the service spacer and the service shims separately. Add the measurements together in order
to determine the total shim pack thickness.

24. Assemble the right side shim pack using one 4.318 mm (0.170 in) service spacer and the

appropriate amount of service shims equaling the thickness determined in step 22. Measure
the service spacer and the service shims separately. Add the measurements together in order
to determine the total shim pack thickness.

25. Install the differential assembly with the differential side bearings and the differential side

bearing cups.

26. Install the left side service spacer and service shim into the axle housing. The service shim

must be installed between the service spacer and the differential side bearing cup.

27. Install the right side service spacer between the axle housing and the differential side

bearing cup.

28. Install the right side service shim into the axle housing using the J 25588 , if necessary. The

service shim must be installed between the service spacer and the differential side bearing
cup.

2007 Hummer H3

2007 Driveline/Axle Rear Drive Axle - H3

29. Install the differential bearing caps and the bolts.

Tighten: Tighten the differential bearing cap bolts to 75 N.m (55 lb ft).

30. Rotate the pinion several times to ensure the drive pinion and differential side bearings have

seated.

31. Measure the rotating torque of the drive pinion and differential side bearings using an inch-

pound torque wrench. Record the measurement.

Specification: The rotating torque of the drive pinion and differential side bearings should
be approximately 3.9-6.2 N.m (30-55 lb in) for new bearings or 2.8-5.1 N.m (25-45 lb in)
for used bearings.

32. Calculate the differential side bearing preload by subtracting the drive pinion preload,

measured in Step 2, from the drive pinion and differential case bearing preload, measured in
Step 33. Multiply the value obtained by the axle ratio.

Specification: The differential side bearing preload should be 1.7-4.0 N.m (15-35 lb in).

33. If the differential side bearing preload is not within specifications, add or subtract shim

thickness equally from each shim pack as necessary in order to increase/decrease the side
bearing preload.

34. Once the differential side bearing preload is correct, measure the backlash and adjust, if

necessary. Refer to Backlash Adjustment.

35. Once the differential side bearing preload and backlash is correct, perform a gear tooth

contact pattern check in order to ensure proper alignment between the ring and pinion gears.
Refer to Gear Tooth Contact Pattern Inspection.

Shim Method

NOTE:

Refer to Fastener Notice .

IMPORTANT:

The differential side bearings must have preload before the
backlash adjustment can be started.

In order to maintain the original backlash, adjust the
differential case side bearing preload by changing the
thickness of the left and the right side shim packs equally.

Measure the service shims and the service spacers one at a
time. Add the measurements together in order to obtain the

2007 Hummer H3

2007 Driveline/Axle Rear Drive Axle - H3

1. Install the drive pinion, if necessary. Refer to Drive Pinion and Ring Gear Replacement.

2. Measure the rotating torque of the drive pinion using an inch-pound torque wrench. Record

the measurement.

Specification: The rotating torque for the drive pinion bearings should be 1.7-3.4 N.m (15-
30 lb in) for new bearings or 1.1-2.3 N.m (10-20 lb in) for used bearings.

3. If the rotating torque for the drive pinion bearings is not within specifications, adjust as

necessary. Refer to Drive Pinion and Ring Gear Replacement.

4. Install the differential assembly with the differential side bearings and bearing cups into the

axle housing.

5. Insert one BENT 1.016 mm (0.040 in) thick service shim into the right side axle housing.

Side the differential assembly towards the bent service shim in order to hold the shim in
place.

6. While holding the differential assembly against the bent service shim, install one 4.318 mm

(0.170 in) thick service spacer into the left side axle housing.

7. Move the differential assembly to the right until the ring gear contacts the drive pinion.

Once the ring gear contacts the drive pinion, continue to move the ring gear towards the
drive pinion to until all backlash is removed.

8. While holding the ring gear against the drive pinion, insert progressively larger service

shims between the service spacer and the differential side bearing cup until a moderate
resistance can be felt.

9. Once the largest service shim has been determined, measure the thickness of the shim using a

micrometer. Measure the service shim in 3 locations. Calculate the average of the 3
measurements. Use the average as the thickness for the shim. Record the measurement.

10. Install the service shim that was just measured back into the left side of the axle housing.

The service shim must be installed between the service spacer and the differential side
bearing cup.

total thickness of the left or the right side shim pack.

Do not use or reuse the original cast iron production shims.
Use service shims and service spacers instead.

IMPORTANT: Before installation of the case assembly, ensure that the side

bearing surfaces in the axle housing are clean and free of
burrs. If the original bearings are to be reused, the original
bearing cups must also be used.

2007 Hummer H3

2007 Driveline/Axle Rear Drive Axle - H3