Differential Drive Pinion Gear Bearing Replacement (8.6, 9.5, 11.5 Inch Axle)
Differential Drive Pinion Gear Bearing Replacement (8.6, 9.5, 11.5 Inch Axle)
Special Tools
* DT 47688 - Pinion Bearing Remover
* DT 49032 - Inner Pinion Bearing Race Installer
* J 7818 - Inner Bearing Race Installer
* J 8092 - Universal Driver Handle 3/4-10
* J 8592 - Universal Driver Handle 3/4-10 (12 inch long)
* J 8608 - Pinion Bearing Cup Installer
* J 8611-01 - Pinion Bearing Cup Installer
* J 8614-01 - Flange Holder and Remover
* J 22306 - Bearing Race Installer
* J 22828 - Input Shaft Gear Installer
* J 22912 - Bearing Remover
* J 36614 - Inner Pinion Bearing Installer
* J 44412 - Pinion Bearing Installer, 11.5 inch axle
* J 44417 - Pinion Bearing Installer, 11.5 inch axle
* J 45240 - Pinion Bearing Installer, 11.5 inch axle
Disassemble Procedure
1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle Service and Repair.
2. Remove the differential assembly. Refer to Differential Replacement (8.6, 9.5/9.5 LD Inch Axles) Differential Replacement (8.6, 9.5/9.5 LD Inch Axles)Differential Replacement (10.5 Inch, 11.5 Inch Axle) Differential Replacement (10.5 Inch, 11.5 Inch Axle).
3. Remove the drive pinion from the axle. Refer to Drive Pinion and Ring Gear Replacement (8.6, 9.5/9.5 LD, and 11.5 Inch Axles) Drive Pinion and Ring Gear Replacement (8.6, 9.5/9.5 LD, and 11.5 Inch Axles)Drive Pinion and Ring Gear Replacement (10.5 Inch Axle) Drive Pinion and Ring Gear Replacement (10.5 Inch Axle).
Note:
Step 4 is for those vehicles equipped with the 8.6 inch axle.
4. Using the DT 47688 - remover and a press, remove the bearing from the drive pinion.
Note:
Step 5 is for those vehicles equipped with the 9.5 LD inch axle and the 11.5 inch HD axle.
5. Using the J 22912 - remover and a press, remove the differential pinion bearing.
6. Remove the shim (1).
Note:
Move the drift back and forth between one side of the cup and the other in order to work the cups out of the housing evenly.
7. Using a hammer and a brass drift in the slots provided, remove the outer pinion bearing cup from the axle housing.
Note:
Move the drift back and forth between one side of the cup and the other in order to work the cups out of the housing evenly.
8. Using a hammer and a brass drift in the slots provided, remove the inner pinion bearing cup from the axle housing.
Assemble Procedure
1. Using the J 8611-01 - installer, 8.6 inch axle, or the J 7818 - installer, 9.5/9.5 LD inch axle (1), or the J 8608 - installer 11.5 inch axle and the J 8092 - handle (2), install the outer pinion bearing cup.
2. Using the DT 49032 - installer, 8.6 inch axle, or the J 22306 - installer, 9.5/9.5LD inch axle (2), or the J 44417 - installer 11.5 inch axle the and the J 8092 - handle (1), install the inner pinion bearing cup.
Note:
Step 3 is for those vehicles equipped with the 11.5 inch axle with casting number 40089759.
3. Using the J 45240 - installer (1) and the J 8592 - handle (2), install the inner pinion bearing cup.
4. Determine the selective shim thickness for the drive pinion. Refer to Pinion Depth Adjustment (10.5 Inch Axle) Pinion Depth Adjustment (10.5 Inch Axle)Pinion Depth Adjustment (8.6, 9.5/9.5 LD and 11.5 Inch Axles) Pinion Depth Adjustment (8.6, 9.5/9.5 LD and 11.5 Inch Axles).
5. Install the selective shim (1) on the shoulder on the differential pinion gear (2).
Note:
Press the bearing on until the cone seats on the pinion shim.
6. Using the J 22828 - installer or the J 36614 - installer, or the J 44417 - installer for the 11.5 inch axle, install the inner pinion bearing.
7. Install a new collapsible spacer.
8. Lubricate the pinion bearings with axle lubricant. Use the proper fluid. Refer to Fluid and Lubricant Recommendations Maintenance.
9. Install the outer pinion bearing into the axle housing.
10. Install the differential pinion gear into the axle housing.
Note:
DO NOT re-use the old pinion nut, replace with NEW only.
11. Install the NEW differential pinion oil seal, flange/yoke, and the NEW nut and washer. Refer to Drive Pinion Flange/Yoke and/or Oil Seal Replacement Rear Drive Axle.
12. Using an inch-pound torque wrench, measure the rotating torque of the pinion should be between 1.0-2.3 Nm (10-20 lb in) for used bearings, or 1.7-3.4 Nm (15-30 lb in) for new bearings.
13. If the rotating torque measurement is below 1.0 Nm (10 lb in) for used bearings, or 1.7 Nm (15 lb in) for new bearings, continue to tighten the pinion nut in small increments, until the torque required in order to rotate the pinion is between 1.0-2.3 Nm (10-20 lb in) for used bearings, or 1.7-3.4 Nm (15-30 lb in) for new bearings.
14. Once the specified torque is obtained, rotate the pinion several times to ensure the bearings have seated.
15. Recheck the rotating torque of the pinion bearing and adjust if necessary.
16. Install the differential assembly. Refer to Differential Replacement (8.6, 9.5/9.5 LD Inch Axles) Differential Replacement (8.6, 9.5/9.5 LD Inch Axles)Differential Replacement (10.5 Inch, 11.5 Inch Axle) Differential Replacement (10.5 Inch, 11.5 Inch Axle).
17. Fill the axle with lubricant. Use the proper fluid. Refer to Differential Oil Replacement (8.6 Inch Axle) Differential Oil Replacement (8.6 Inch Axle)Differential Oil Replacement (11.5 Inch Axle) Differential Oil Replacement (11.5 Inch Axle)Differential Oil Replacement (10.5 Inch Axle) Differential Oil Replacement (10.5 Inch Axle)Differential Oil Replacement (9.5LD Inch Axle) Differential Oil Replacement (9.5LD Inch Axle).
18. Remove the support and lower the vehicle.