26. Using new ring gear bolts, alternately tighten each ring gear bolt to the proper torque:
- 3/8” Bolts = 50 lb ft
- 7/16” Bolts - 80 lb ft
- 1/2” Bolts = 100 lb ft
27. For adjuster nuts, skip to Step 35.
28. Select two shims of approximately equal size whose total thickness is equal to the shim pack thickness determined in Step 21.
29. Place the differential assembly with the ring gear, bearing cups and shims into the differential housing. Install bearing caps and bolts in their proper position and tighten bolts. While tightening bearing cap bolts, continuously rock the ring gear back and forth to confirm backlash. If at any time the backlash becomes reduced to zero, remove bearing caps and adjust the shim packs by removing .010” from the ring gear side and adding .010” to the opposite side. Repeat as needed until both bearing caps can be torqued to the proper torque value and ring and pinion backlash is confirmed.
30. Rotate the differential case several revolutions to seat the bearings. Check the backlash as described in Step 6.
31. Compare the backlash reading to the original reading taken in Step 6 and adjust as needed. To increase backlash, remove shim thickness from the ring gear side and add an equal amount of shim thickness to the opposite side. To decrease backlash, add shim thickness to the ring gear side and remove an equal amount of shim thickness from the opposite side.
Note: Approximately .001” of shim equals .001” of backlash.
32. Once the correct backlash reading has been established, add .004” of shim thickness to both shim packs to preload the differential bearings. It will be necessary to drive the shims into position. Do not hit the bearing cups. It is advantageous to use a Case Spreader to install the differential.
33. Torque the bearing cap bolts to the proper value and rotate the differential case several revolutions to seat the bearings. Recheck the backlash and correct if necessary.
34. Skip to Step 47.
35. Place the differential assembly with ring gear and bearing cups into the differential carrier.
36. Apply a light coat of axle oil to the bearings and adjuster nut threads.
37. Install the bearing caps in their original position and hand tighten the bearing cap bolts.
38. Install the adjuster nuts (unless still in the differential housing) being careful not to cross thread the adjuster nuts causing thread damage.
39. With the adjuster nuts installed and the bearings in position, torque the bearing cap bolts to the proper torque value.
40. For Chrysler 8-1/4 and 9-1/4, skip to Step 46.
41. Loosen the RH adjuster nut (opposite the ring gear) until it is away from the bearing cup.
Tighten the LH adjuster nut (ring gear side) until the ring gear is slightly forced into the drive pinion (zero backlash). Rotate the differential several revolutions to ensure no binding is present. Recheck RH adjuster nut to be sure that it is not against the RH bearing cup. Use an appropriate tool to turn adjuster nuts.
42. Install indicator as shown in Figure 6. Tighten RH adjuster nut until a case spread of .008 - .012 is measured. Rotate drive pinion several times in each direction to seat the bearings and to be sure that binding does not occur. It may be necessary to readjust the case spread by tightening the RH adjuster nut.
43. Measure the backlash as done in Step 6. If necessary, adjust the backlash until it matches the original reading taken in Step 6. Increase backlash by loosening the LH adjuster and tightening the RH adjuster the same amount. Decrease backlash by loosening the RH adjuster nut and tightening the LH adjuster nut the same amount.
When making adjustments, always make the final adjustment in the tightening direction. For example, if the adjuster needs to be loosened one notch, loosen it two notches and tighten it one. When the proper backlash has been established, install the adjuster nut locks.