Pinion Bearing Preload and Final Depth Check

1. Assemble oil slinger (if used) onto pinion. Assemble differential pinion bearing (4621) using Axle Bearing/Seal Plate T75L-1165-B and Axle Bearing/Seal Replacer T75L-1165-DA.

   
   
   
   
   

2. Assemble outer differential pinion bearing, oil slinger and pinion seal into housing. Coat the pinion seal with grease. Install the pinion seal with Pinion Seal Replacer T56T-4676-B. After installation, make sure the garter spring did not pop out. If the garter spring pops out, remove and replace pinion seal.

   
   
   
   
   

3. Assemble drive pinion shims onto pinion and install pinion into housing.

4. Assemble end yoke, washer and old pinion nut. Install the end yoke with Companion Flange Replacer T85T-4851-AH, if necessary, to draw the drive pinion up to engage the nut. Tighten nut to 298-379 Nm (220-280 lb-ft).

5. Using a Nm (lb-in) torque wrench, rotate pinion. The torque required to rotate the pinion should be between 2.25-4.52 Nm (20-40 lb-in). To increase preload, remove drive pinion shims from pinion. To decrease preload, add drive pinion shims to pinion.

6. If rotating torque is within specifications, remove nut and install new pinion nut and tighten to 298-379 Nm (220-280 lb-ft).

The following illustration shows the arrow in the pinion pointing in two directions.

• The arrow pointing toward the end yoke indicates by removing drive pinion shims, the distance from the centerline of the axle to the pinion mounting surface (back face of pinion) is increased giving a plus reading.
• The arrow pointing toward the drive pinion indicates by adding pinion shims, the distance from the centerline of the axle to the pinion button is decreased, giving a minus reading.
• The pinion bearing preload shim pack does not affect the pinion depth setting.
• However, drive pinion shim change will affect pinion preload. If position of pinion is changed, the preload shim pack must be changed in the same amount in order not to change preload.
• The arrows on the ring gear show the method for increasing or decreasing ring gear backlash by inserting or removing differential bearing shims (4067).

7. If removed, install the yoke with Companion Flange Replacer T85T-4851-AH if necessary to draw the drive pinion up to engage the nut.

8. Install the new washer and nut and tighten nut to 298-379 Nm (220-280 lb-ft).