2008 Subaru Outback Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Front Differential Assembly: Adjustment

  1. Using the ST, screw-in the differential side retainer until resistance is felt.

    ST 18630AA010 WRENCH COMPL RETAINER

    NOTE:
    • Screw-in the RH side slightly deeper than the LH side.
    • ST WRENCH ASSEMBLY (499787000) can also be used.
      Fig 1: Identifying Differential Side Retainer
      G05002728Courtesy of SUBARU OF AMERICA, INC.
  2. Remove the oil pump housing.
  3. Remove the liquid gasket from the mating surface completely.
  4. Install the oil pump housing assembly to the converter case, and secure them by tightening the four bolts evenly.
    NOTE: Use an old gasket or aluminum washer to prevent damaging the mating surface of the housing.

    Tightening torque: 

    41 N.m (4.2 kgf-m, 30.2 ft-lb) 

    Fig 2: Installing Oil Pump Housing Assembly
    G05002696Courtesy of SUBARU OF AMERICA, INC.
  5. Rotate the drive pinion a few times using ST1 and ST2.

    ST1 498937110 HOLDER

    ST2 499787700 WRENCH

    Fig 3: Rotating Drive Pinion
    G05002697Courtesy of SUBARU OF AMERICA, INC.
  6. Tighten the LH differential side retainer by rotating the shaft until resistance is felt. Then loosen the RH side differential side retainer. Tighten the LH differential side retainer until the pinion shaft no longer turns, and continue to loosen the RH side. This is the "zero" state.
    Fig 4: Identifying Differential Side Retainer
    G05668503Courtesy of SUBARU OF AMERICA, INC.
  7. After reaching the "zero" state, loosen the LH differential side retainer by three notches and secure it with the lock plate. Then after returning the RH differential side retainer, retighten until it stops. Rotate the drive pinion 2 or 3 times. Tighten the RH differential side retainer further by 1-3/4 notches. This sets the preload. Finally, secure the differential side retainer with the lock plate.
    Fig 5: Identifying Lock Plate
    G05668504Courtesy of SUBARU OF AMERICA, INC.
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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.