Transfer Reduction Driven Gear: Adjustment

Measure depth "A" from the ST upper face to the ball bearing catch surface.
ST 398643600 GAUGE

Fig 1: Measuring Distance Between Gauge Upper Face With Ball Bearing Catch Surface
Courtesy of SUBARU OF AMERICA, INC.
Measure height "B" from the ST to the end of the ball bearing outer ring.
ST 398643600 GAUGE

Fig 2: Measuring Distance Between Gauge And End Of Ball Bearing Outer Ring
Courtesy of SUBARU OF AMERICA, INC.

Obtain the thickness of shim using the following formula to select none to two shims.

T mm = (A - 15) - (B + 15) - (0.05 - 0.25)

[T in = (A - 0.591) - (B + 0.591) - (0.002 - 0.01)]

T: Shim thickness

A: Depth from the ST upper face to the ball bearing catch surface

B: Height from the ST to the end of the ball bearing outer ring

15 mm (0.591 in): Thickness of ST

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