Pinion Depth Adjustment

Pinion Depth Adjustment
^ Tools Required
- J 36601 Pinion Shim Selector Kit
- J 29763 Dial Indicator





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

1. Lubricate the pinion bearings with axle lubricant.
2. Assemble the J29763 to the J 36601-4 (8.25 inch axle) or the J 36601-3 (9.25 inch axle).
3. Install the pinion bearings and hold them in place.
4. Insert the J 36601-7 through the pinion bearings.
5. Assemble the following components through the pinion bearings:
^ For the 8.25 inch axle, assemble the J 21777-35, the washer, and the nut.
^ For the 9.25 inch axle, assemble the J 21777-8, the washer, and the nut.
6. While holding the J 36601-7 stationary, install an inch-pound torque wrench on the nut of the J 36601-7 and tighten the nut until a rotating torque of 1.0 - 1.7 Nm (10 - 15 inch lbs.) is obtained.
Rotate the assembly several times in both directions in order to seat the pinion bearings.
7. Check the rotating torque of the assembly. If the torque is less than 1.0 Nm (10 inch lbs.), tighten the nut on the J 36601-7 until a rotating torque of 1.0 - 1.7 Nm (10 - 15 inch lbs.) is obtained.





Important: For the 9.25 inch axle, the bearing retainer assembly must be removed prior to placing the J 36601-3 in the differential side bearing bore.

8. Adjust the J 29763 to the differential bearing bore by doing the following:
8.1. Loosen the lock nut on the J29763.
8.2. Place the contact pad of the J 29763 on the differential side bearing bore.
8.3. With the contact pad of the J29763 touching the differential side bearing bore, push down on the J29763 until the needle of the J 29763 has turned 3/4 of a turn clockwise.
8.4. Tighten the lock nut of the J29763.
9. Rotate the J 36601-4 (8.25 inch axle) or the J 36601-3 (9.25 inch axle) back and forth until the needle of the J29763 indicates the lowest point in the differential side bearing bore.
10. At the lowest point of deflection, move the housing of the J 29763 until the needle indicates zero.
11. Move the J 36601-4 (8.25 inch axle) or the J 36601-3 (9.25 inch axle) back and forth again to verify the zero setting. Adjust the housing of the J 29763 as necessary to set the needle to zero.





12. After the zero setting is obtained and verified, grasp the J 36601-4 (8.25 inch axle) or the J 33601-3 (9.25 inch axle) by the flats and move the J 33601-4 (8.25 inch axle) or the J 33601-3 (9.25 inch axle) out of the differential side bearing bore.
13. The value indicated on the J29763, is the thickness of the shim needed in order to set the depth of the pinion.
14. Select the shim that indicates the proper thickness. Measure the shim with a micrometer in order to verify that the thickness is correct.
15. Remove the pinion depth setting tools.
16. Remove the pinion bearings.
17. Install the pinion shim between the pinion and the inner pinion bearing.