Collapsible Spacer

REMOVAL w/PINION INSTALLED
1. Raise and support the vehicle.
2. Remove wheel and tire assemblies.
3. Remove rear brake drums.
4. Mark the propeller shaft and pinion yoke for installation reference.
5. Remove the propeller shaft from the yoke.
6. Rotate the pinion gear three or four times.
7. Measure the amount of torque necessary to rotate the pinion gear with a (inch lbs.) dial-type torque wrench. Record the torque reading for installation reference.
8. Using Holder 6958 to hold the pinion yoke, remove the pinion nut and washer.

Pinion Yoke Removal:

9. Use Remover C-452 and Wrench C-3281 to remove the pinion yoke.
10. Use a suitable pry tool or a slide hammer mounted screw to remove the pinion shaft seal.
11. Remove the front pinion bearing using a pair of suitable pick tools to pull the bearing straight off the pinion gear shaft. It may be necessary to lightly tap the end of the pinion gear with a rawhide or rubber mallet if the bearing becomes bound on the pinion shaft.
12. Remove the collapsible spacer.

REMOVAL w/PINION REMOVED
1. Raise and support the vehicle.
2. Remove wheel and tire assemblies.
3. Remove rear brake drums.
4. Mark the propeller shaft and pinion yoke for installation reference.
5. Remove the propeller shaft from the yoke.
6. Rotate the pinion gear three or four times.
7. Measure the amount of torque necessary to rotate the pinion gear with a (inch lbs.) dial-type torque wrench. Record the torque reading for installation reference.
8. Remove differential assembly from axle housing.
9. Using Holder 6958 to hold yoke, remove the pinion yoke nut and washer.

Pinion Yoke Removal:

10. Using Remover C-452 and Wrench C-3281, remove the pinion yoke from pinion shaft.

Remove Pinion Gear:

11. Remove the pinion gear from housing. Catch the pinion with your hand to prevent it from falling and being damaged.
12. Remove collapsible spacer from pinion shaft.

INSTALLATION

Collapsible Preload Spacer:

1. Install a new collapsible preload spacer on pinion shaft.
2. If pinion gear was removed, install pinion gear in housing.
3. Install pinion front bearing, if necessary.

Pinion Seal Installation:

4. Apply a light coating of gear lubricant on the lip of pinion seal. Install seal with Installer C-3972-A and Handle C-4171.

Pinion Yoke Installation:

5. Install yoke with Screw 8112, Cap 8109, and Holder 6958.
6. If the original pinion bearings are being used, install differential assembly and axle shafts, if necessary.

NOTE: If new pinion bearings were installed, do not install the differential assembly and axle shafts until after the pinion bearing preload and rotating torque are set.

7. Install the yoke washer and a new nut on the pinion gear. Tighten the pinion nut until there is zero bearing end-play.
8. Tighten the nut to 271 Nm (200 ft. lbs.).

CAUTION: Never loosen pinion gear nut to decrease pinion gear bearing rotating torque and never exceed specified preload torque. If preload torque or rotating torque is exceeded a new collapsible spacer must be installed. The torque sequence will then have to be repeated.

Tightening Pinion Nut-Typical:

9. Using yoke holder 6958 and a torque wrench set at 474 Nm (350 ft. lbs.), crush collapsible spacer until bearing end play is taken up.

NOTE: If more than 474 Nm (350 ft. lbs.) of torque is necessary to remove the bearing end play, the collapsible spacer is defective and must be replaced.

Check Pinion Gear Rotation Torque:

10. Slowly tighten the nut in 6.8 Nm (5, ft. lbs.) increments until the rotating torque is achieved. Measure the rotating torque frequently to avoid over crushing the collapsible spacer.
11. Check rotating torque with a (inch lbs.) torque wrench. The torque necessary to rotate the pinion gear should be:
- Original Bearings - The reading recorded during removal, plus an additional 0.56 Nm (5 inch lbs.).
- New Bearings - 2 to 5 Nm (15 to 35 inch lbs.).
12. Install differential assembly and axle shafts, if necessary.
13. Align marks made previously on yoke and propeller shaft and install propeller shaft.
14. Install rear brake drums.
15. Add gear lubricant, if necessary. Refer to Lubricant Specifications of this section for lubricant requirements.
16. Install wheel and tire assemblies.
17. Lower vehicle.