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Home >> Subaru >> 2017 >> WRX Base >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Continuously Variable Transaxle (CVT) (Service Information)) >> Front Differential Assembly >> Assembly >> Differential Case Assembly

Differential Case Assembly

WARNING: This page is about a different variant/trim than selected.
  1. Install the washer and differential bevel gear into differential case (LH).
    Fig 1: Installing Washer And Differential Bevel Gear Into Differential Case (LH)
    G06654722Courtesy of SUBARU OF AMERICA, INC.
  2. Install the differential bevel gear pinions into differential case (LH) and install the pinion shaft.
    Fig 2: Installing Differential Bevel Gear Pinions Into Differential Case (LH)
    G11577961Courtesy of SUBARU OF AMERICA, INC.
  3. Install the straight pin.
    Fig 3: Installing Straight Pin
    G06654724Courtesy of SUBARU OF AMERICA, INC.
  4. Install the differential case (RH) to hypoid driven gear and secure with vise.
    Fig 4: Installing Differential Case (RH) To Hypoid Driven Gear
    G06654725Courtesy of SUBARU OF AMERICA, INC.
  5. Install the washer and differential bevel gear to the differential case (RH).
    Fig 5: Removing Differential Bevel Gear And Washer From Differential Case
    G06654714Courtesy of SUBARU OF AMERICA, INC.
  6. Using the ST, install the hypoid driven gear by tightening the installation bolt.

    ST 18270KA020 SOCKET (E20)

    Tightening torque: 

    20 N.m (2.0 kgf-m, 14.8 ft-lb) 

    Fig 6: Removing Hypoid Driven Gear Mounting Bolt Using ST
    G06654712Courtesy of SUBARU OF AMERICA, INC.
  7. While checking the tightening angle with the angle gauge, further tighten the hypoid driven gear mounting bolts.

    Tightening angle: 

    45°±2° 

  8. Measurement of backlash (selection of washer)
    1. Install the SUBARU genuine axle shaft to differential case.

      Part No. 38415AA070 Axle shaft

    2. Measure the gear backlash using ST1 and ST2, and then insert the ST2 through the window of differential case.

    ST1 498247001 MAGNET BASE

    ST2 498247100 DIAL GAUGE

    NOTE:
    • Measure the backlash by applying a differential bevel pinion tooth between two differential bevel gear teeth.
    • When measuring, fix the differential bevel pinion in place with a screwdriver covered with cloth, or a similar tool.

    Specification: 

    0.13 - 0.18 mm (0.0051 - 0.0071 in) 

    Fig 7: Measuring Gear Backlash Using ST1 And ST2
    G06654728Courtesy of SUBARU OF AMERICA, INC.
  9. If the backlash is not within specification, select a washer from the table below and replace.
    Washer
    Part No. Thickness mm (in)
    803038021 0.95 (0.037)
    803038022 1.00 (0.039)
    803038023 1.05 (0.041)
  10. Using the ST, install the left and right taper roller bearings.

    ST1 499277100 BUSHING 1-2 INSTALLER

    ST2 398497701 SEAT

    Fig 8: Installing Left And Right Taper Roller Bearings
    G06654729Courtesy of SUBARU OF AMERICA, INC.
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