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Differential Side Bearings Assemble

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Tools Required

    Fig 1: Install/Remove J 42168-9 Thumbscrew
    GM354439Courtesy of GENERAL MOTORS CORP.
  1. Remove the J 42168-9  and thumbscrew from the J 42168-1  . See Special Tools and Equipment .
    2. Fig 2: Left Bearing Race Bore & J 42168-1 Removed
    GM354433Courtesy of GENERAL MOTORS CORP.
  2. Remove the J 42168-1  from the left bearing race bore of the differential housing. See Special Tools and Equipment .
    3. Fig 3: Installing J 42168-13 Into Vice
    GM708132Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Level the tool in order to obtain accurate measurements.
  3. Install the J 42168-13  into a vice. See Special Tools and Equipment .
    4. Fig 4: Differential Case & Bearing Race
    GM84675Courtesy of GENERAL MOTORS CORP.
  4. Position the bearing race (2) onto the J 42168-13  (3). See Special Tools and Equipment .
  5. Position the differential case (1) onto the J 42168-13  (3) and into the bearing race (2). See Special Tools and Equipment . Rotate the differential, in both directions, in order to seat the bearing to the race.
    6. Fig 5: Installing J 42168-7 Into Bottom Of Bearing Race Bore
    GM84676Courtesy of GENERAL MOTORS CORP.
  6. Install the J 42168-7  (2) into the hole in J 42168-2  (1). See Special Tools and Equipment . Loosen the thumbscrew and allow the rod to contact the bottom of the bearing race bore, machined surface (3).
  7. Tighten the thumbscrew.
  8. Remove the J 42168-7  from the J 42168-2  . See Special Tools and Equipment .
    9. Fig 6: Installing J 42168-7 Into Oil Passages Of Differential
    GM708137Courtesy of GENERAL MOTORS CORP.
  9. Install the J 42168-7  (2) into one of the two oil passages of the differential (1). See Special Tools and Equipment . The tapered portion of the tool will wedge and be retained into the differential.
  10. Rotate the differential until the rod of J 42168-7  is above the J 42168-13  (3) gage block. See Special Tools and Equipment .
    11. Fig 7: Upper Gage Block & Lower Gage Block
    GM708158Courtesy of GENERAL MOTORS CORP.
  11. The J 42168-13  upper gage block location (1) is used when servicing 2. See Special Tools and Equipment .73 ratio differentials. The lower gage block location (2) is used when servicing the 3.15 and 3.42 ratio differentials.
    12. Fig 8: Measuring Distance Between Rod Of J 42168-7 & Gage Block Using A Feeler Gage
    GM708141Courtesy of GENERAL MOTORS CORP.
  12. Using a feeler gage, measure the distance between the rod of J 42168-7  and the gage block of J 42168-13  . See Special Tools and Equipment . Record the measurement as dimension C1.
  13. Subtract C1 value from a C nominal value of 5 mm (0.197 in). Record that calculation as C2.

    Refer to the applicable calculation table in Spacer and Shim Specifications .

    14. Fig 9: Locating A1 Value & A2 Value On Side Of Ring Gear
    GM708130Courtesy of GENERAL MOTORS CORP.
  14. Locate the A2 value (2) on the side of the ring gear.
    15. IMPORTANT: The A2 value is a manufacturing variation between the ring gear and pinion. The A2 value may be higher, lower, or equal to 65.5 mm (2.58 in), 3.15 and 3.42 ratio differentials, or 74.5 mm (2.93 in), 2.73 ratio differential, nominal value. When subtracting the D nominal value from the A2 value, the C3 calculation may compute to a positive, negative, or zero total.
  15. Subtract the D nominal value of either 65.5 mm (2.58 in) or 74.5 mm (2.93 in) from the A2 value. Record the calculation as C3.
  16. Add the C2 value to the C3 value for the proper left side differential bearing shim thickness. The C3 value may be a positive, negative, or zero value.
    17. Fig 10: Pinion Housing/Cage Bolts
    GM177407Courtesy of GENERAL MOTORS CORP.
  17. Select shims equal to the calculated value. It may be necessary to round the shim or shims total to obtain the proper shim sizes. If the shim thickness calculation is past the midpoint value, round the number to the next decimal value. Refer to Rear Axle Specifications .
  18. Remove the pinion housing/cage bolts (1).
    19. Fig 11: Differential Housing & Pinion Housing/Cage Assembly
    GM708121Courtesy of GENERAL MOTORS CORP.
  19. Remove the pinion housing/cage (1) from the differential.
    20. Fig 12: Bearing Races & Components
    GM354430Courtesy of GENERAL MOTORS CORP.
  20. Remove the J 42168-11  , bearings (3 and 6), spacer (5), and J 42168-2  (7) from the pinion housing/cage (4). See Special Tools and Equipment .
    21. Fig 13: Differential, Housing Race & Shim
    GM708085Courtesy of GENERAL MOTORS CORP.
  21. Use the J 42170  and a hydraulic press in order to install the selected shims (1) and bearing race (2) to the differential housing. See Special Tools and Equipment .
    22. Fig 14: 42155 Differential Case, Differential Housing & J 42155
    GM708165Courtesy of GENERAL MOTORS CORP.
  22. Use the J 42155  in order to install the differential case into the differential housing. See Special Tools and Equipment .
    23. Fig 15: Right Side Bearing Race, Differential & J 42168-15
    GM708171Courtesy of GENERAL MOTORS CORP.
  23. Install the right side bearing race (2), and the J 42168-15  (1) onto the differential. See Special Tools and Equipment .
    24. Fig 16: Differential, Cover & J 42168-16 Bolts
    GM708174Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: In order to perform the shim selection procedure:
    • The oil seal must be removed from the cover - right.
    • The pinion housing/cage must NOT be installed to the differential case.
  24. Install the cover - right (2) and J 42168-16  bolts and spacers to the differential. See Special Tools and Equipment . Position the J 42168-16  bolts and spacers evenly apart. See Special Tools and Equipment .

    Tighten:  Tighten the bolts to 25 N.m (18 lb ft).

    25. Fig 17: Right Side Differential Bearing
    GM708180Courtesy of GENERAL MOTORS CORP.
  25. Insert a feeler gage into the J 42168-15  and measure the gap. See Special Tools and Equipment . The measured dimension is the right side differential bearing shim size.
    26. Fig 18: Differential, Cover & J 42168-16 Bolts
    GM708174Courtesy of GENERAL MOTORS CORP.
  26. Remove the bolts (1), cover (2), and tools.
    27. Fig 19: Bearing Race & Shims
    GM354444Courtesy of GENERAL MOTORS CORP.
  27. Install the selected shim (2) and bearing race (1) to the cover - right.
    28. Fig 20: Pressing Shims & Bearing Race Into Cover Using J 42170 & Hydraulic Press
    GM72519Courtesy of GENERAL MOTORS CORP.
  28. Install the shim or shims and bearing race into the cover - right using the J 42170  and a hydraulic press. See Special Tools and Equipment . Refer to Rear Axle - Assemble .
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