Differential Drive Pinion Gear Bearing Replacement (8.6 Inch Axle)
Differential Drive Pinion Gear Bearing Replacement
Special Tools
* DT 47688 - Pinion Bearing Remover
* J 8092 - Universal Drive Handle 3/4 in-10
* J 8611-01 - Pinion Bearing Cup Installer
* J 22828 - Input Shaft Gear Installer
* J 22912-B - Bearing Puller
* J 36614 - Inner Pinion Bearing Installer
* J 45870 - Inner Pinion Bearing Race Installer
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 .
3. Remove the differential drive pinion gear. Refer to Drive Pinion and Ring Gear Replacement .
4. For the 8.6 inch axle, use the DT 47688 - remover and a press remove the drive pinion bearing and the spacer.
5. For the 9.5LD inch axle, use the J 22912-B - puller and a press to remove the drive pinion bearing.
Note: When performing the following service procedure, 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
6. Using a hammer and a brass drift in the slots provided, remove the outer pinion bearing cup from the axle housing.
Note: When performing the following service procedure, 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 inner pinion bearing cup from the axle housing.
Assemble Procedure
1. Using the J 8092 - handle (2) and the J 8611-01 - installer (1), install the outer pinion bearing cup.
2. Using the J 8092 - handle (2) and the J 45870 - installer (1), install the inner pinion bearing cup.
3. Determine the selective shim thickness for the drive pinion. Refer to Pinion Depth Adjustment .
4. Install the shim (1) on the differential drive pinion gear (2).
5. Using the J 22828 - installer or the J 36614 - installer and a hammer, install the inner pinion bearing until the pinion bearing seats on the drive pinion shim.
6. Install a new collapsible spacer.
7. Lubricate the pinion bearings with the axle lubricant. Refer to Fluid and Lubricant Recommendations Maintenance.
8. Install the outer pinion bearing (2) into the differential drive pinion gear (1).
9. Install the drive pinion flange/yoke and or oil seal. Refer to Drive Pinion Flange/Yoke and/or Oil Seal Replacement Service and Repair.
10. Using an inch-pound torque wrench, measure the rotating torque of the drive pinion should be between 1.0-2.3 Nm (10-20 lb in) for used bearings and 1.7-3.4 Nm (15-30 lb in) for new bearings.
11. 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, as needed, until the desired rotating torque specifications are reached as indicated in steps 10 and 11.
12. Once the specified torque is obtained, rotate the pinion several times to ensure the bearings have seated.
13. Recheck the rotating torque and adjust if necessary.
14. Install the differential assembly. Refer to Differential Replacement .
15. Fill the axle with lubricant. Use the proper fluid. Refer to Differential Oil Replacement .
16. Remove the support and lower the vehicle.