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Side Bearing Preload

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NOTE: Adjust drive pinion depth prior to performing side bearing preload adjustment. See DRIVE PINION DEPTH  .
NOTE: Contact supplier for list of available shim sizes.
  1. Remove the differential side bearing shims. Determine the pinion position shim and the pinion preload shims, if necessary. Install the differential side bearing without the side bearing shims by doing the following:
    1. In order to protect the differential case, install the Side Bearing Puller Pilot (J-36597) in the case on the side opposite of the bearing installation.
    2. Install the differential side bearing. Install the Differential Side Bearing Installer (J-24430) and Universal Driver Handle (J-8092) over the differential side bearing.
    3. Drive the differential side bearing into position using the differential side bearing installer and universal driver handle.
  2. Install the differential assembly into the axle housing. Move the differential assembly to the left until the left differential side bearing is against the left side bearing bore.
    3. NOTE: Install the bearing caps into the same position from which each was removed.
  3. Install the left side bearing cap. Install the left side bearing cap bolts. Tighten the bearing cap bolts finger tight. DO NOT torque the bolts to specification at this time.
    4. NOTE: In order to accurately measure the differential side bearing shim thickness, the differential side bearing race must be evenly seated against the differential side bearing.
  4. While holding the differential assembly against the left side bearing bore, press the right side bearing race against the right differential side bearing.
  5. Using a feeler gauge, measure the distance between the right side bearing race and the right side bearing bore. Use progressively larger feeler gauge sizes until a moderate drag is felt. Repeat this step several times while rotating the differential case in order to obtain a consistent reading. This measurement, measurement a, is the total shim pack thickness for the differential assembly without preload.
    6. CAUTION: To prevent personal injury and/or component damage, support the differential case when removing the case from the axle housing. If the case is not supported, the differential case could fall and cause personal injury or damage to the differential case.
  6. Remove the left side bearing cap bolts. Remove the left side bearing cap. Install the right side bearing cap. Install the right side bearing cap bolts. Tighten the bearing cap bolts finger tight. DO NOT torque the bolts to specification at this time. While holding the differential assembly ring gear against the drive pinion, press the left side bearing race against the left differential side bearing.
    7. NOTE: In order to accurately measure the differential side bearing shim thickness, the differential side bearing race must be evenly seated against the differential side bearing.
  7. Using a feeler gauge, measure the distance between the left side bearing race and the left side bearing bore. Use progressively larger feeler gauge sizes until a moderate drag is felt. Repeat this step several times while re-positioning the differential case in order to obtain a consistent reading. This measurement is the left side shim thickness for the differential assembly without preload.
  8. In order to determine the right side shim thickness, subtract the left side measurement from the total shim measurement. This measurement is the thickness for the right side shim thickness without preload or setting the initial backlash. Remove the right side bearing cap bolts. Remove the right side bearing cap. Remove the differential assembly.
  9. Remove the differential side bearings. Install the Differential Side Bearing Remover (J-45711) and the side bearing puller pilot. Using a hydraulic press, remove the differential side bearings. Add 0.010" (0.25 mm) of shim thickness to the right side shim thickness measurement previously determined. This additional amount will set the differential side bearing preload and the initial backlash.
  10. The number of shims required in order to equal the correct thickness may consist of one or more shims. Install the right side shim thickness onto the differential case. Measure the shims one at a time. Add the measurements together in order to obtain the total thickness of the right side shim pack.
  11. Install the right differential side bearing with the side bearing shim. In order to protect the differential case, install the Side Bearing Protector (J-8107-3) in the case on the side opposite of the bearing installation. Place the differential side shim thickness on top of the differential case. Place the differential side bearing on top of the differential case.
  12. Using procedure similar to right side bearing, install the left side bearing shim thickness and differential side bearing.
  13. Install the differential assembly into the axle housing. See OVERHAUL  . Adjust the backlash. See BACKLASH & FINAL ASSEMBLY  under ADJUSTMENTS.
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