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 J 42173 (2).
Notice:
Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
2. Install four M8 x 1.25 bolts (3).
Tighten
Tighten the bolts to 25 Nm (18 lb ft).
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). Refer to Drive Pinion Assemble.
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 snug.
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
Tighten the bolts to 25 Nm (18 lb ft).
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 B nominal value of 5 mm (0.197 in). Record that calculation as B2. Refer to the applicable calculation tables in Spacer and Shim Specifications.
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 in) nominal value. When subtracting the A nominal value from the A1 value, the B3 calculation may compute to a positive, negative, or zero total.
12. Subtract the A nominal value of 103.00 mm (4.055 in) from the A1 value. 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 calculated 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.
Refer to Rear Axle Specifications.