Ring Gear and Drive Pinion Set Up - 9.75 Inch
1. Assemble and position Pinion Depth Gauge.
(1) Position Screw.
(2) Position Aligning Adapter.
(3) Position Gauge Disc.
(4) Position Gauge Block.
(5) Position the inner differential pinion bearing.
(6) Position the outer differential pinion bearing.
(7) Thread on Driver Handle and tighten.
NOTE: Apply only a light oil film on the differential pinion bearings before assembling Pinion Depth Gauge.
2. Rotate Gauge Block several half-turns to ensure proper seating of the pinion bearings, and position Gauge Block.
NOTE: Gauge Block must be offset to obtain an accurate reading.
3. Install Gauge Tube.
(1) Position Gauge Tube and paper shipping tags.
(2) Position the differential bearing caps.
(3) Install the differential bearing cap bolts.
4. Use a pinion bearing adjustment shim as a gauge for shim selection.
NOTE:
- Pinion bearing adjustment shims must be flat and clean.
- A slight drag should be felt for correct shim selection. Do not attempt to force the pinion shim between Gauge Block and Gauge Tube. This will minimize selection of a pinion shim thicker than required, which results in a deep tooth contact in the final assembly.
5. Install the drive pinion.
6. Position the differential case in the axle housing and install a shim on the left side of the differential case.
7. Position the left bearing cap and loosely install the bearing cap bolts.
NOTE:
- Triangles on the bearing caps must point outboard.
- Push the differential case toward the left side of the axle housing to make sure the left bearing cup is seated.
8. Install progressively larger shims on the right side of the differential case until the largest shim selected can be inserted by hand.
9. Position the right side differential bearing cap and tighten the bolts.
10. Rotate the differential case to make sure it rotates freely.
NOTE: If backlash is within specification, go to Step 18.
11. Use Dial Indicator/Magnetic Base to measure ring gear backlash.
- Turn the ring gear without turning the pinion gear and record the measurement.
NOTE: Specification shown is the maximum ring gear backlash allowable.
12. To increase backlash, install a (A) thicker shim and a (B) thinner shim as shown.
- If backlash is not within specification, correct by increasing the thickness of one differential bearing shim and decreasing the thickness on the other differential bearing shim by the same amount.
NOTE: The bearing caps must be removed before shims can be installed.
13. To decrease backlash, install a (A) thicker shim and a (B) thinner shim as shown.
NOTE: The bearing caps must be removed before shims can be installed.
14. Install the differential bearing caps.
(1) Position the differential bearing caps.
(2) Install the differential bearing cap bolts.
15. Rotate the differential case several times to ensure the differential bearings are seated.
16. Use Dial Indicator/Magnetic Base to measure the backlash.
- If backlash is not within specification, adjust accordingly.
NOTE: Specification shown is the maximum ring gear backlash allowable.
17. Remove the differential bearing caps.
(1) Remove the differential bearing cap bolts.
(2) Remove the differential bearing caps.
18. Use Shim Driver to install the differential bearing shims ensuring they are fully seated.
NOTE: To establish differential bearing preload, increase both left and right shim sizes by the specification shown.
19. Install the differential bearing caps.
(1) Position the differential bearing caps.
(2) Install the differential bearing cap bolts.
20. Rotate the differential case several times to ensure the differential bearings are seated.
21. Use Dial Indicator/Magnetic Base to verify the ring gear backlash is within specification.
NOTE: Specification shown is the maximum ring gear backlash allowable.
22. Remove Dial Indicator/Magnetic Base from the axle housing.