10.5 Inch Axle
Locking Differential Adjustment (10.5 Inch Axle)Adjustment of the Differential
1. If it is necessary to replace the cam gear, the right hand side gear, or the reaction blocks, the entire differential must be adjusted. The differential is adjusted using selective thickness thrust washers behind each side gear, and the selective thickness thrust washers between the reaction blocks.
2. Build up the differential properly.
The proper clearance between parts is critical to the operation of the unit.
3. Note the three adjustments necessary as follow:
^ The left side gear backlash
^ The right side gear backlash
^ The thrust block clearance
Right Side Gear Backlash Adjustment
^ Tools Required
- J 7872 Magnetic Base Dial Indicator
1. Install the cam unit and the side gear thrust washer to the right case half.
2. Clamp the cam unit in place using a set of washers, nut, and a bolt long enough to hold the cam unit in place.
3. Place the pinion gears and the pinion thrust washers on the pinion yoke.
4. Install the yoke firmly to the differential case half.
5. Loosen the nut.
6. Index one pinion gear tooth to point downward, perpendicular to the case half face.
^ Tighten the nut.
7. Mount a dial indicator on the case half face using a magnetic base.
8. Place the stem of the dial indicator on the pinion gear tooth.
9. Push the pinion gear firmly into the seat.
^ Rotate the gear back and forth while reading the dial indicator.
^ Record the reading.
^ Do not unseat the pinion yoke. This will make the backlash reading inaccurate.
10. Repeat steps 5 through 9 on the remaining 2 pinions.
11. The backlash should be between 0.254 and 0.457 mm (0.010 and 0.018 inch).
12. If the backlash is too high, use a thicker side gear thrust washer.
13. If the backlash is too low, use a thinner side gear thrust washer.
Left Side Gear Backlash Adjustment
1. Assemble the clutch plates. Alternate the plates as shown.
2. Assemble the guide clips to the plates. Use grease in the clips in order to hold them in place on the plates.
3. Install the following parts to the differential:
^ The side gear thrust washer
^ The clutch plate assembly
^ The left side gear
4. Install the clamp the side gear in place using a set of washers, a nut, and a bolt long enough to hold the side gear in place.
5. Place the pinion gears and the pinion thrust washers on the pinion yoke.
6. Install the yoke firmly to the differential case half.
7. Loosen the nut and the index one pinion gear tooth to point downward, perpendicular to the case half face. Tighten the nut.
8. Mount a dial indicator on the case half face using a magnetic base.
9. Place the stem of the dial indicator on the pinion gear tooth.
10. Push the pinion gear firmly into the seat.
^ Rotate the gear back and forth while reading the dial indicator.
^ Record the reading.
^ Do not unseat the pinion yoke. This will make the backlash reading inaccurate.
11. Repeat steps 7 through 10 on the other 2 pinions.
12. The backlash should be between 0.051 and 0.254 mm (0.002 and 0.010 inch).
13. If the backlash is too high, use a thicker pinion thrust washer.
14. If the backlash is too low, use at a thinner position thrust washer.
Reaction Block Clearance Adjustment
^ Tools Required
- J 34672 Depth Micrometer
- J 34673 Flat Gage Bar
- J 26900-2 Combination Micrometer
1. Install the left side gear thrust washer, the clutch plates, and the side gear.
Bolt the parts into position.
2. Install the right side gear thrust washer and cam assembly. Bolt the parts into position.
3. Measure the distance from the side gear face to the case half face.
3.1. The thickness of the straight edge must be subtracted from the reading.
3.2. Add the measurement of both sides together. This is the side gear spread.
4. Measure the thickness of the original reaction blocks and the reaction block thrust washers together.
5. If the combined reaction block and the thrust washer thickness is not 0.000 to 0.1524 mm (0.000 to 0.006 inch) less than the side gear spread, adjust the clearance using the following procedure:
^ Select a new reaction block thrust washer of the correct thickness in order to obtain 0.000 to 0.1524 mm (0.000 to 0.006 inch) clearance.
^ Reshim the left and/or the right clutch disc pack.
Maintain the side gear backlash.
^ Some of the older locking differentials had select fit reaction blocks without a between thrust washer. These models require replacing the reaction blocks with the correct thickness reaction block.