Differential Case Assembly

WARNING: This page is about a different car, the 2021 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.

Install the differential bevel gear and differential bevel pinion together with washer, and install the pinion shaft.
NOTE: Apply differential gear oil on the sliding portion of the differential bevel gear, thrust washer and pinion shaft.

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Measure the backlash, and select the washer.

Install the SUBARU genuine axle shaft to differential case.
Part No. 38415AA070

AXLE SHAFT

Using a dial gauge and a magnet stand, measure the backlash by inserting the dial gauge through the window of differential case.

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)

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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)

Align the pinion shaft and differential case holes, and install the spring pin to the holes from the hypoid driven gear side using the ST.
NOTE: Use new spring pin.

Preparation tool:

ST: STRAIGHT PIN REMOVER (899904100)

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Using the ST1 and ST2, install the left and right taper roller bearings.
Preparation tool:

ST1: BUSHING 1-2 INSTALLER (499277100)

ST2: SEAT (398497701)

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