Pinion Depth Adjustment
TOOLS REQUIRED^ J-34175-4 Front Pilot Washer
^ J-34175-2 Rear Pilot Washer
^ J-21777-43 Stud Assembly-Bolt
^ J-39837-1 Side Bearing Discs
^ J-23597-1 Arbor
^ J-39837-2 Gauge Plate
^ J-8001 Dial Indicator
^ Or Equivalent
1. Clean all the gauge parts.
2. Lubricate the front and bearings with axle lubricant.
3. Place the bearings (34) and (35) into the pinion bearing races.
4. Install J-34175-4, J-34175-2, J-21777-43 and J-39837-2 to the pinion bore
5. Hold the stud stationary at the flats of the stud. Tighten the stud nut.
^ Torque 2.2 Nm (1.6 ft. lbs.).
6. Rotate the gauge plate and bearings several complete revolutions to seat the bearings.
7. Tighten the stud nut until a torque of 1.6 to 2.2 Nm (1.2 to 1.6 ft. lbs.) is required to keep the gauge plate in rotation.
8. Assemble J-39337-1, J-23597-1, and J-8001 to the differential bearing bores as shown.
NOTE: The bearing bores must be clean and burr free.
9. Install the carrier side bearing caps and tighten the bolts finger tight.
10. Rotate the gauge plate until the gauging area is parallel with the discs.
11. Position the arbor assembly in the carrier so that the plunger rod is centered on the gauge area of the gauge block.
12. Set the dial indicator at zero. Push the indicator down on the indicator shaft until the needle rotates approximately 3/4 of a turn to the right. Tighten the dial indicator in this position.
13. Rotate the arbor assembly slowly back and forth until the dial indicator reads the greatest deflection (when the indicator needle is centered between moving to the left and to the right).
14. At the point of greatest deflection, set the dial indicator to zero. Repeat the rocking action of the gauge shaft to verify the zero setting.
15. Rotate the arbor assembly until the dial indicator rod does not touch the gauge block.
16. Record the actual number on the dial indicator and not the number which represents how far the needle travels. This is the nominal pinion setting.
17. Check the pinion face for a pinion adjustment mark. This mark indicates the best running position for the pinion from the nominal setting.
- If the pinion is stamped with a plus number, subtract that many thousandths from the nominal setting. If the nominal setting is 0.063 in and the pinion is marked +2, the correct shim depth would be 0.063 inch - 0.002 inch = 0.061 inch.
- If the pinion is stamped with a minus number, add that many thousandths from the nominal setting. If the nominal setting is 0.063 in and the pinion is marked -2, the correct shim depth would be 0.063 inch + 0.002 inch = 0.065 inch.
- If the pinion has no plus or minus marked on the pinion, use the nominal pinion setting to select a shim.
18. Remove bearing caps (1) and depth gauging tools.
19. Install the correct pinion shim (31).
NOTE: Do not install pinion gear into housing at this time.