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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS H1500, VAN PASSENGER, GASREPAIR AND DIAGNOSIS (SINGLE PAGE)DRIVELINES & AXLESDIFFERENTIALS & DRIVE AXLESFRONT DRIVE AXLEREPAIR INSTRUCTIONSPINION DEPTH ADJUSTMENTPROCEDURE
2008 Chevrolet Chevy Express H1500, Van Passenger, Gas

Pinion Depth Adjustment: Procedure

2008 Chevrolet Chevy Express H1500, Van Passenger, GasSECTION Procedure
    IMPORTANT: Make sure all of the tools, the pinion bearings, and the pinion bearing cups are clean before proceeding.
  1. Lubricate the pinion bearings with axle lubricant. Refer to Fluid and Lubricant Recommendations .
  2. Install the J 33838-2 (1) and the bolt (2) to the outer pinion bearing.
    3. Fig 1: J 33838-2 & Bolt To Outer Pinion Bearing
    GM782599Courtesy of GENERAL MOTORS CORP.
  3. Install the J 33838-2 (1) and the bolt (2) with the outer pinion bearing into the differential carrier assembly case half.
    4. Fig 2: Inner Pinion Bearing Onto J 33838
    GM782601Courtesy of GENERAL MOTORS CORP.
  4. Install the inner pinion bearing onto the J 33838  as shown. See Special Tools .
    5. Fig 3: J 33838 With Inner Pinion Bearing Into Differential Carrier Assembly
    GM782603Courtesy of GENERAL MOTORS CORP.
  5. Install the J 33838  (2) with the inner pinion bearing into the differential carrier assembly and the bolt (1). See Special Tools .
  6. While holding the J 33838  stationary, install an inch-pound torque wrench on the bolt of the J 33838  and tighten the bolt. See Special Tools .

    Tighten:  Tighten the bolt until a rotating torque of 1.7-3.4 N.m (15-30 lb in) for new bearings or 1.0-2.3 N.m (10-20 lb in) for used bearings is obtained.

  7. Rotate the assembly several times in both directions in order to seat the pinion bearings.
  8. Check the rotating torque of the assembly. If the torque is less than 1.7 N.m (15 lb in) for new bearings or 1.0 N.m (10 lb in) for used bearings, continue to tighten the bolt until a rotating torque of 1.7-3.4 N.m (15-30 lb in) for new bearings or 1.0-2.3 N.m (10-20 lb in) for used bearings is obtained.
  9. Place the contact pad of the J 33838  into the differential side bearing bore. See Special Tools .
  10. Install the J 29763  to the J 33838  by doing the following. See Special Tools .
    1. Install the collar and the lock nut onto the J 33838  . See Special Tools .

      Do not tighten the lock nut at this time.

    2. Install the J 29763  into the collar. See Special Tools .
    3. Place the stem of the J 29763  onto the contact surface of the J 33838  . See Special Tools .
    4. With the stem of the J 29763  touching the contact surface of the J 33838  , push down on the J 29763  until the needle of the J 29763  has turned 3/4 of a turn clockwise. See Special Tools .
    5. Tighten the lock nut of the J 29763  finger tight. See Special Tools .
  11. Rotate the J 33838  back and forth until the needle of the J 29763  indicates the lowest point in the differential side bearing bore. See Special Tools .
    12. Fig 4: J 29763 Housing Installed In Differential Carrier
    GM782606Courtesy of GENERAL MOTORS CORP.
  12. At the lowest point of deflection, move the housing of the J 29763  until the needle indicates ZERO. See Special Tools .
  13. Move the J 33838  back and forth again to verify the ZERO setting. See Special Tools . Adjust the housing of the J 29763  as necessary to set the needle to ZERO. See Special Tools .
    14. Fig 5: Determining Shim Thickness
    GM782608Courtesy of GENERAL MOTORS CORP.
  14. After the ZERO setting is obtained and verified, grasp the J 33838  by the flats and move the contact pad of the J 33838  out of the differential side bearing bore. See Special Tools .
  15. The value indicated on the J 29763  is the thickness of the shim needed in order to set the depth of the pinion. See Special Tools .
  16. Select the shim that indicates the proper thickness. Measure the shim with a micrometer in order to verify that the thickness is correct.
  17. Remove the pinion depth setting tools.
  18. Remove the pinion bearings from the pinion depth setting tools.
  19. Assemble the differential carrier assembly. Refer to Differential Carrier Assembly Assemble .
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.