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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Drivelines & Axles >> Differentials & Drive Axles >> Rear Drive Axle >> Repair Instructions >> Differential Clutch Oil Replacement >> Installation Procedure

Installation Procedure

NOTE:

Both the fluid level and clutch motor current parameter requirements must be met to ensure the differential is filled to specifications.

  1. Install the differential clutch cover.
    2. CAUTION:

    Refer to Fastener Caution .

    NOTE:

    The following tighten procedure MUST BE PERFORMED TWICE to ensure the proper sealing around the accumulator and the filter.

  2. Install the differential cover bolts and tighten to 6 N.m (53 lb in) in a star pattern and repeat this torque sequence twice to ensure proper sealing around the accumulator and the filter.
    3. CAUTION:

    Fluids for the differential clutch and the rear axle are different. The fluids must never be mixed or interchanged or vehicle damage will result.

  3. Fill the differential clutch with 350 ml (12 ounces) of the proper differential fluid through the vent hose fitting hole. Refer to Adhesives, Fluids, Lubricants, and Sealers .
  4. Remove the supports and lower the vehicle.
  5. To stabilize the oil level, let the vehicle rest for 10 minutes with the ignition off.
  6. Start the engine and allow to run for 5 minutes at idle.
  7. In park, cycle the throttle to wide open briefly 5 times to cycle solenoids to purge air.
  8. Shut the vehicle off.
  9. Raise the vehicle.
    10. Fig 1: Identifying Rear Axle Lubricant Fill Plug
    GM2019182Courtesy of GENERAL MOTORS COMPANY
  10. Remove the differential clutch level inspection plug (1).
  11. The differential clutch fluid should be level with the bottom of the differential clutch fluid level inspection plug hole.
  12. If needed, install the differential clutch level inspection plug and add 50 ml (1.7 ounce) through the vent fitting hole. Repeat step 4 through 11.
    13. Fig 2: Differential Clutch Vent Hose And Fitting
    GM2512995Courtesy of GENERAL MOTORS COMPANY
  13. Install the vent hose fitting (2) and tighten to 14 N.m (10 lb ft).
  14. Install then vent hose (1).
  15. Lower the vehicle.
  16. Install the scan tool.
    17. NOTE:

    When the clutch pump motor cycles from OFF to ON the current will also cycle from 0mA to 2500-3500mA. DTC C0407 64 is set when the pump current is CONSTANTLY BELOW 2500mA.

  17. With engine running, observe the scan tool Rear Differential Clutch Pump Motor Current parameter. The parameter display should be between 2500-3500mA when the pump is on. If the parameter is below 2500mA, repeat step 12.
  18. Once desired parameter is reached check to ensure proper differential clutch fluid level. Remove fluid level inspection plug and allow any excess fluid to drain level with plug opening.
    19. CAUTION:

    Refer to Fastener Caution .

  19. Install the fill plug and tighten to 14 N.m (10 lb ft).
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