Differential Case Assembly

2014 Subaru Forester 2.5i, Eng CD FB25BA, Standard TransSECTION Differential Case Assembly
WARNING: This page is about a different variant/trim than selected.
  1. Install the washer and differential bevel gear into the differential case (RH).
    Fig 1: Identifying Washer And Differential Bevel Gear
    G08318146Courtesy of SUBARU OF AMERICA, INC.
  2. Install the differential bevel pinions into differential case (RH) and install the pinion shaft.
    Fig 2: Identifying Pinion Shaft, Bevel Gear And Differential Bevel Pinion
    G09481810Courtesy of SUBARU OF AMERICA, INC.
  3. Install the straight pin.
    Fig 3: Locating Straight Pin
    G08318148Courtesy of SUBARU OF AMERICA, INC.
  4. Install the washer and differential bevel gear to the differential case (LH).
    Fig 4: Identifying Washer And Differential Bevel Gear
    G08318146Courtesy of SUBARU OF AMERICA, INC.
  5. Install the differential case (RH) to the hypoid driven gear.
    Fig 5: Installing Differential Case (RH) To Hypoid Driven Gear
    G08318150Courtesy of SUBARU OF AMERICA, INC.
  6. Install the differential case (LH) to the differential case (RH).
  7. Using the ST, install the hypoid driven gear by tightening the installation bolt.

    ST 18270KA020 SOCKET (E20)

    Tightening torque:Β 

    64 N.m (6.5 kgf-m, 47.2 ft-lb)Β 

    Fig 6: Installing Hypoid Driven Gear
    G08318151Courtesy of SUBARU OF AMERICA, INC.
  8. Measure the backlash, and select the washer.
    1. Install the SUBARU genuine axle shaft to differential case.

      Part No. 38415AA070 Axle shaft

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

      ST1 498247001 MAGNET BASE

      ST2 498247100 DIAL GAUGE

      Specification:Β 

      0.13 - 0.18 mm (0.0051 - 0.0071 in)Β 

      Fig 7: Measuring Backlash Using Dial Gauge
      G08318152Courtesy of SUBARU OF AMERICA, INC.
    3. 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)
  9. 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
    G08318153Courtesy of SUBARU OF AMERICA, INC.
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.