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Home >> Subaru >> 2019 >> WRX STI Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Manual Transaxle & Differential (TY751)) >> Differential Side Retainer Oil Seal >> Replacement

Differential Side Retainer Oil Seal: Replacement

WARNING: This page is about a different variant/trim than selected.
  1. Disconnect the ground terminal from battery sensor. Refer to NOTE>NOTE>BATTERY .
  2. Remove the front tires.
  3. Lift up the vehicle.
  4. Using the TORX® bit T70, remove the drain plug, and drain the transmission gear oil completely.
    CAUTION:
    • Immediately after the vehicle has been running or after idling for a long time, the gear oil will be hot. Be careful not to receive burns.
    • Be careful not to spill the gear oil on the exhaust pipe, to prevent emission of smoke or causing a fire. If gear oil is spilled, wipe it off completely.
  5. Attach the drain plug using TORX® bit T70.
    NOTE: Use a new gasket.

    Tightening torque: 

    44 N.m (4.5 kgf-m, 32.5 ft-lb) (aluminum gasket, silver)

    70 N.m (7.1 kgf-m, 51.6 ft-lb) (copper gasket, brown)

    70 N.m (7.1 kgf-m, 51.6 ft-lb) (metal gasket, black)

    G05332645Courtesy of SUBARU OF AMERICA, INC.
  6. Remove the center exhaust pipe (rear). Refer to EXHAUST (EXCEPT FOR STI)>CENTER EXHAUST PIPE>REMOVAL .
  7. Remove the stabilizer link.
    G10268621Courtesy of SUBARU OF AMERICA, INC.
  8. Remove the bolt securing the ball joint of the front arm to the housing, then separate the front arms and the housing.
    G10268622Courtesy of SUBARU OF AMERICA, INC.
  9. Using a crowbar, separate the left and right front drive shafts.
    G08318895Courtesy of SUBARU OF AMERICA, INC.
  10. Remove the differential side retainer oil seal.
    NOTE:
    • Be sure to replace the oil seal after removing the front drive shaft from the transmission.
    • Use the ST 398527700 PULLER ASSY to remove the oil seal. If removing the oil seal with a flat tip screwdriver, be careful not to scratch the differential side retainer.
  11. Using the ST, install the differential side retainer oil seal by lightly tapping with a plastic hammer.
    CAUTION:
    • Apply transmission gear oil to the oil seal lips, and install the oil seal while being careful not to deform the lip.
    • Check the identification marks (L, R) during installation not to mix up the oil seals RH and LH.
    NOTE: Use a new oil seal.
    ST 18675AA000 DIFFERENTIAL SIDE OIL SEAL INSTALLER
    G05002972Courtesy of SUBARU OF AMERICA, INC.
  12. Set the ST to differential side retainer.
    ST 28399SA010 OIL SEAL PROTECTOR
  13. Replace the circlip of the front drive shaft with a new part.
  14. Install the front drive shaft and remove ST.
    ST 28399SA010 OIL SEAL PROTECTOR
    G08318906Courtesy of SUBARU OF AMERICA, INC.
  15. Insert the front arm ball joint and tighten the mounting bolt.

    Tightening torque: 

    50 N.m (5.1 kgf-m, 36.9 ft-lb)

    G10268633Courtesy of SUBARU OF AMERICA, INC.
  16. Replace the flange nut with a new part and install the stabilizer link.

    Tightening torque: 

    60 N.m (6.1 kgf-m, 44.3 ft-lb)

    G10268621Courtesy of SUBARU OF AMERICA, INC.
  17. Install the center exhaust pipe (rear). Refer to EXHAUST (EXCEPT FOR STI)>CENTER EXHAUST PIPE>INSTALLATION .
  18. Lower the vehicle.
  19. Pour in transmission gear oil and check the oil level. Refer to MANUAL TRANSMISSION AND DIFFERENTIAL (6MT) (TY75)>TRANSMISSION GEAR OIL .
  20. Install the front tires.
  21. Connect the ground terminal to battery sensor. Refer to NOTE>NOTE>BATTERY .
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