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Home >> Subaru >> 2003 >> Impreza TS, Automatic >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Overhaul >> Front Differential >> Adjustment

Front Differential: Adjustment

  1. Using ST, screw in the retainer until a resistance is felt.
    NOTE: Screw in the RH side slightly deeper than the LH side.

    ST 499787000 WRENCH ASSY

    Fig 1: Screwing In Retainer Until Resistance Is Felt Using ST
    G01999083Courtesy of SUBARU OF AMERICA, INC.
  2. Remove the oil pump housing.
  3. Thoroughly remove the liquid gasket from the mating surface.
  4. Install the oil pump housing assembly to the torque converter clutch case, and secure evenly by tightening four bolts.
    NOTE: Use an old gasket or an aluminum washer so as not to damage the mating surface of the housing.
    1. Tightening torque:  41 N.m (4.2 kgf-m, 30.4 ft-lb)
    Fig 2: Installing Oil Pump Housing Assembly To Torque Converter Clutch Case
    G01999084Courtesy of SUBARU OF AMERICA, INC.
  5. Rotate the drive pinion several times with ST1 and ST2.

    ST1 498937110 HOLDER

    ST2 499787700 WRENCH

    Fig 3: Rotating Drive Pinion Several Times With ST1 & ST2
    G01999085Courtesy of SUBARU OF AMERICA, INC.
  6. Tighten the LH retainer until a resistance is felt while rotating the shaft. Then loosen the RH retainer. Keep tightening the LH retainer and loosening the RH retainer until the pinion shaft can no longer be turned. This is the "zero" state.
    Fig 4: Tightening LH Retainer & Loosening RH Retainer Until Pinion Shaft Can No Longer Be Turned
    G01999086Courtesy of SUBARU OF AMERICA, INC.
  7. After the "zero" state is established, back off the LH retainer 3 notches and secure it with the lock plate. Then back off the RH retainer and retighten until it stops. Rotate drive pinion a few times. Tighten the RH retainer 1-3/4 notches further. This sets the preload. Finally, secure the retainer with its lock plate.
    Fig 5: Securing With Lock Plate
    G01999087Courtesy of SUBARU OF AMERICA, INC.
    NOTE: Turning the retainer by one tooth changes the backlash about 0.05 mm (0.0020 in).
    Fig 6: Turning Retainer By One Tooth
    G01999088Courtesy of SUBARU OF AMERICA, INC.
  8. Turn the drive pinion several rotations with ST1 and check to see if the backlash is within the standard value with ST2, ST3, ST4 and ST5.

    ST1 499787700 WRENCH

    ST2 498247001 MAGNET BASE

    ST3 498247100 Dial gauge

    ST4 499787500 ADAPTER

    ST5 498255400 Plate

    1. Backlash:  0.13 - 0.18 mm (0.0051 - 0.0071 in)
    Fig 7: Identifying STs
    G01999089Courtesy of SUBARU OF AMERICA, INC.
  9. Adjust the tooth contact between front differential and drive shaft. See ADJUSTMENT , Drive Pinion Shaft Assembly.
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