Drive Pinion Shim Selection
Drive Pinion Shim Selection^ Tools Required
- J 42168-1 Differential Centerline Cylinder
- J 42168-2 Shim Gauge Assembly
- J 42168-9 Centerline Cylinder Holding Strap
- J 42168-11 Pinion Housing Centering Spacer
- J 42173 Differential Holding Fixture
Important: The pinion depth adjustment procedure and shim selection must be performed prior to pinion shaft and housing assembly.
1. Install the differential assembly (1) onto the J42173 (2).
Notice: Refer to Fastener Notice in Service Precautions.
2. Install four M8 x 1.25 bolts (3).
^ Tighten the bolts to 25 Nm (18 ft. lbs.).
Pinion Shim Calculation Example (with a negative B3 value)
Pinion Shim Calculation Example (with a Positive B3 value)
3. Install the J 42168-1 into the left bearing race bore of the differential housing.
4. Install the J 42168-9 and thumbscrew to the J 42168-1.Tighten the thumbscrew until snug.
5. Install the bearing races into the pinion housing (4).
6. Install the J 42168-11 (2), bearings (3 and 6), spacer (5), J 42168-2 (7), and bolt (1) to the pinion housing (4). Tighten the bolt until sung.
7. Install the pinion housing assembly (1) into the differential housing.
The use of M8 x 1.25 dowels or long bolts will ease in pinion housing installation and alignment.
Important: ALL of the pinion housing bolts must be installed in order to obtain an accurate measurement and correct shim selection.
8. Install the pinion housing bolts (1).
^ Tighten the bolts to 25 Nm (18 ft. lbs.).
9. Using a feeler gauge, measure the distance between the J 42168-2 and the J 42168-1. Record the dimension as B1.
10. Subtract the B1 value from a nominal value of 5 mm (0.197 inch). Record that calculation as B2.
11. Locate the A1 value (1) on the side of the ring gear.
Important: The A1 value is a manufacturing variation between the ring gear and pinion. The A1 value may be higher, lower, or equal to 103.00 mm (4.055 inch) nominal value. When subtracting the A1 value from the nominal value of 103.00 mm (4.055 inch), the B3 calculation may compute to a positive, negative, or zero total.
12. Subtract the A1 value from a nominal value of 103.00 mm (4.055 inch). Record the calculation as B3.
13. Add the B2 value to the B3 value for the proper pinion housing shim thickness. The B3 value may be a positive, negative, or zero value.
14. Select shims equal to the B3 value. It may be necessary to round the shim(s) total to obtain the proper size shim pack. If the shim thickness calculation is past the midpoint value, round the number higher to the next decimal value.