Pinion Depth Adjustment 8.6 Inch Axle

Tools Required

Important: Make sure all of the tools, the differential side bearing bores, and the pinion bearing cups are clean before proceeding.

1. Lubricate the pinion bearings with axle lubricant. Refer to Fluid and Lubricant Recommendations .
2. Install the pinion bearings into the axle housing.
3. Assemble the J 21777-35 (1), the J 21777-43 (2), the J 21777-42 (3), and the J 21777-29 (4) into the axle housing as shown.
4. While holding the J 21777-43 stationary, install an inch-pound torque wrench on the nut of the J 21777-43 and tighten the nut until a rotating torque of 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 is obtained.

Rotate the assembly several times in both directions in order to seat the pinion bearings.

5. Check the rotating torque of the assembly. If the torque is less than 1.7 N·m (15 lb in) for new bearings or 1.1 N·m (10 lb in) for used bearings, continue to tighten the nut on the J 21777-43 until a rotating torque of 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 is obtained.



6. Assemble the J 21777-45 (1, 2) to the J 21777-1 (3) into the differential side bearing bore of the axle housing as shown.
7. Install the differential bearing caps.

Notice: Refer to Fastener Notice in the Preface section.

8. Install the differential bearing cap bolts.

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

9. Rotate the J 21777-1 within the J 21777-45. The J 21777-1 must rotate back and forth freely within the discs. If the J 21777-1 does not rotate freely, disassemble the components, inspect for proper seating and/or mis-aligned components and re-assemble.



10. Align the plunger of the J 21777-1 (1) to the 8.5 in gage block setting of the J 21777-29 (2).
11. Install the J 8001 to the J 21777-1 as follows:

11.1.

Loosely clamp the J 8001 onto the stem on the J 21777-1.

11.2.

Place the contact pad of the J 8001 onto the mounting post of the J 21777-1.

11.3.

With the contact pad of the J 8001 touching the mounting post of the J 21777-1, loosen the lock nut on the J 8001 and push down on the J 8001 until the needle the J 8001 has turned 3/4 of a turn clockwise.

11.4.

Tighten the clamp on the J 8001 finger tight.

12. Move the plunger of the J 21777-1 back and forth until the needle of the J 8001 indicates the greatest deflection.

The deflection is the point where the needle changes direction.




13. At the greatest point of deflection, move the housing of the J 8001 until the needle indicates zero.
14. Move the plunger of the J 21777-1 back and forth again to verify the zero setting. Adjust the housing of the J 8001 as necessary to set the needle to zero.
15. Rotate the plunger of the J 21777-1 away from the J 21777-29.
16. The value indicated on the J 8001 is the thickness of the shim needed in order to set the depth of the pinion.
17. Select the shim that indicates the proper thickness. Measure the shim with a micrometer in order to verify that the thickness is correct.
18. Remove the pinion depth setting tools.
19. Remove the pinion bearings.
20. Install the pinion shim between the pinion gear and the inner pinion bearing. Refer to Drive Pinion Bearings Replacement .

Pinion Depth Adjustment 9.75, 10.5 and 10.75 Inch Axles

Special Tools

Important: Make sure all of the tools, the differential side bearing bores, and the pinion bearing cups are clean before proceeding.

1. Lubricate the pinion bearings with axle lubricant. Refer to Fluid and Lubricant Recommendations .



2. Assemble the J 45692-5 (2) and the outer pinion bearing onto the J 21777-43 (1) as shown.



3. Install the J 45692-5, the outer pinion bearing, and the J 21777-43 into the axle housing.
4. Install the inner pinion bearing into the axle housing.



5. Install the J 21777-35, 9.75 inch axle, or the J 45692-3, 10.5 and 10.75 inch axles, into the inner pinion bearing as shown.



6. Install the J 45692-1 into the axle housing as shown.
7. While holding the J 21777-43 stationary, tighten the nut on the J 21777-43 just until the end play between the pinion bearings is removed.
8. Rotate the assembly several times in both directions in order to seat the pinion bearings.
9. Measure the rotating torque of the assembly using an inch-pound torque wrench.

Specification
The rotating torque of the assembly should be between 2.3-5.1 N·m (20-45 lb in).

10. If the rotating torque of the assembly is less than 2.3 N·m (20 lb in), continue to tighten the nut of the J 21777-43 until a rotating torque of 2.3-5.1 N·m (20-45 lb in) is obtained.



11. Assemble the J 45692-2 (1) and the J 21777-1 (2) as shown.



12. Install the J 45692-2 (1) and the J 21777-1 (2) into the axle housing. Place the stem of the J 21777-1 onto the bottom step of the J 45692-1 for the 9.75 inch axle, the middle step for the 10.5 and 10.75 inch axles.

Notice: Refer to Fastener Notice in the Preface section.

Important: Corresponding letters are stamped on the bearing caps and axle housing. The bearing caps must be reassembled in the same position as removed.

13. Install the bearing caps and bearing cap bolts.

Tighten
Tighten the bearing cap bolts to 109 N·m (80 lb ft).

14. Rotate the J 21777-1 within the J 45692-2. The J 21777-1 must rotate back and forth freely with the discs. If the J 21777-1 does not rotate freely, disassemble the components, inspect for proper seating and/or mis-aligned components and re-assemble.
15. Install the J 8001 to the J 21777-1 as follows:

15.1.

Loosely clamp the J 8001 onto the stem on the J 21777-1.

15.2.

Place the contact pad of the J 8001 onto the mounting post of the J 21777-1.

15.3.

With the contact pad of the J 8001 touching the mounting post of the J 21777-1, loosen the lock nut on the J 8001 and push down on the J 8001 until the needle the J 8001 has turned 3/4 of a turn clockwise.

15.4.

Tighten the clamp on the J 8001 finger tight.




16. Move the plunger of the J 21777-1 (1) back and forth on the bottom step, 9.75 inch axle, or the middle step, 10.5 and 10.75 inch axles, of the J 45692-1 (2) until the needle of the J 8001 indicates the greatest deflection.

The deflection is the point where the needle changes direction.

17. At the greatest point of deflection, move the indicator housing of the J 8001 until the needle indicates ZERO.
18. Move the plunger of the J 21777-1 back and forth again to verify the ZERO setting. Adjust the housing of the J 8001 as necessary to set the needle to ZERO.



19. Rotate the plunger of the J 21777-1 (1) away from the J 45692-1 (2).

The value indicated is the amount of pinion shim thickness required for a nominal pinion setting.

20. In order to adjust the pinion shim thickness for the drive pinion that is to be installed, do the following:

20.1.

Read the number on the button end of the pinion.

If the number on the button end of the pinion is "0", no adjustment of the pinion preload shim pack is necessary.

20.2.

If the number is not "0", the number will also have a corresponding "+" or "-" in front of it.

The "+" or "-" indicates the amount of pinion preload shim thickness that either needs to be added to or subtracted from the amount determined in step 19 in order to the drive pinion gear to be positioned properly within the axle housing.

•

For example, if the number on the button end of the pinion is a "+3", this indicates that 0.0762 mm (0.003 in) of shim thickness will need to be subtracted from the value determined in step 19 in order to place the teeth of the pinion in the best running position with the teeth of the ring gear. Refer to the table.

•	If the number on the button end of the pinion is a "-3", this indicates that 0.0762 mm (0.003 in) of shim thickness will need to be added to the value determined in step 19 in order to place the teeth of the pinion in the best running position with the teeth of the ring gear. Refer to the table.

21. Remove the pinion depth setting tools.
22. Remove the pinion bearings.
23. Install the pinion position shim onto the drive pinion.

Measure the thickness of the shim with a micrometer in order to verify the thickness.




24. Install the inner pinion bearing onto the drive pinion using the J 24433 .



25. Install the pinion bearing preload spacer (1) onto the drive pinion, 10.5 and 10.75 inch axles only.
26. Install the original pinion preload shims (2) onto the drive pinion. If the original shims are not available, assemble 1.52 mm (0.060 in) of pinion preload shims to install.

Measure each shim separately with a micrometer and add the thickness together to determine the total shim pack size.

27. Install the drive pinion with the inner pinion bearing and the pinion preload shims into the axle housing.
28. Install the outer pinion bearing.
29. Install the thrust washer.
30. Seat the pinion yoke onto the pinion shaft by tapping it with a soft-faced hammer until a few pinion shaft threads show through the yoke.
31. Install the washer.
32. Install the pinion yoke nut.

Tighten
Tighten the pinion yoke nut to 252 N·m (186 lb ft).

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

Specification
The rotating torque of the drive pinion should be between 2.3-5.1 N·m (20-45 lb in).

34. If the rotating torque of the drive pinion is not within specifications, adjust the pinion preload shim thickness by doing the following:

34.1.

Install the J 8614-01 to the pinion yoke.

34.2.

Remove the pinion nut while holding the J 8614-01 .

34.3.

Remove the washer.





34.4.

Install the J 8614-2 (2) and the J 8614-3 (3) into the J 8614-01 (1) as shown.

34.5.

Remove the pinion yoke by turning the J 8614-3 (3) clockwise while holding the J 8614-01 (1).

34.6.

Remove the thrust washer.

34.7.

Install the J 22536 .

Ensure that the J 22536 is firmly seated on the drive pinion.

34.8.

Drive the pinion out using the J 22536 and a hammer.

34.9.

Remove the outer pinion bearing.

34.10.

Remove the pinion preload shim(s).

34.11.

Adjust the amount of pinion preload shim thickness by doing the following:

Important: Removing approximately 0.0254 mm (0.001 in) of shim thickness will increase the rotating torque by approximately 71-89 N·m (8-10 lb in).

•	If the rotating torque is too low, remove the appropriate amount of shim thickness from the shim thickness pack using the guideline above.

•	Measure each shim separately with a micrometer and add the thickness together to determine the total shim pack size.

Important: Adding approximately 0.0254 mm (0.001 in) of shim thickness will decrease the rotating torque by approximately 71-89 N·m (8-10 lb in).

•	If the rotating torque is too high, add the appropriate amount of shim thickness to the shim thickness pack using the guideline above.

•	Measure each shim separately with a micrometer and add the thickness together to determine the total shim pack size.

35. Install the new pinion preload shim pack onto the drive pinion.
36. Install the drive pinion with the inner pinion bearing and the pinion preload shims into the axle housing.
37. Install the outer pinion bearing.
38. Install the thrust washer.
39. Seat the pinion yoke onto the pinion shaft by tapping it with a soft-faced hammer until a few pinion shaft threads show through the yoke.
40. Install the washer.
41. Install the pinion yoke nut.

Tighten
Tighten the pinion yoke nut to 252 N·m (186 lb ft).

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

Specification
The rotating torque of the drive pinion should be between 2.3-5.1 N·m (20-45 lb in).

43. If the rotating torque of the drive pinion is not within specification, adjust the pinion bearing preload shim pack as necessary following the steps above.



44. If the rotating torque is within specifications, install the J 8614-01 to the pinion yoke.
45. Remove the pinion nut while holding the J 8614-01 .
46. Remove the washer.



47. Install the J 8614-2 (2) and the J 8614-3 (3) into the J 8614-01 (1) as shown.
48. Remove the pinion yoke by turning the J 8614-3 (3) clockwise while holding the J 8614-01  (1).



49. Install the new pinion oil seal using the J 45710 .
50. Seat the pinion yoke onto the pinion shaft by tapping it with a soft-faced hammer until a few pinion shaft threads show through the yoke.
51. Install the washer.
52. Install the new pinion yoke nut.

Tighten
Tighten the pinion yoke nut to 339 N·m (250 lb ft).

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

Specification
The rotating torque of the drive pinion should be between 2.3-5.1 N·m (20-45 lb in).