Reduction Drive Gear: Adjustment

WARNING: This page is about a different car, the 2020 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.

Remove the reduction drive gear shim.
Install the transmission case, and secure it with four or five bolts.
Tightening torque:

22 N.m (2.2 kgf-m, 16.2 ft-lb)
Measure depth "A" from the ST upper face to the reduction drive gear end face.
Preparation tool:

ST: GAUGE (499575400)

Courtesy of SUBARU OF AMERICA, INC.
Raise and hold the reduction drive gear.

Courtesy of SUBARU OF AMERICA, INC.
Measure depth "B" from the ST upper face to the reduction drive gear end face.
Preparation tool:

ST: GAUGE (499575400)

Courtesy of SUBARU OF AMERICA, INC.

Obtain the thickness of reduction drive gear shim using the following formula to select one to three reduction drive gear shims.

T mm = A - B - (0.05 - 0.25)

[T in = A - B - (0.002 - 0.01)]

T: Reduction drive gear shim thickness

A: Depth from the ST upper face to the reduction drive gear end surface

B: Depth from the ST upper face to the reduction drive gear end surface

0.05 - 0.25 mm (0.002 - 0.01 in): Clearance

Reduction drive gear shim
Part No.	Thickness mm (in)
31288AA261	0.3 (0.012)
31288AA271	0.4 (0.016)
31288AA281	0.5 (0.020)
31288AA291	0.6 (0.024)