Subaru Impreza 2003 Service Manual page 1643

DRIVE PINION SHAFT
AUTOMATIC TRANSMISSION
Corrective action: Increase thickness of drive pin-
ion height adjusting shim in order to move drive pin-
ion close to crown gear.
AT-00212
6) If tooth contact is correct, mark the retainer posi-
tion and loosen it. After fitting a new O-ring and oil
seal, screw in the retainer to the marked position.
Then tighten the lock plate to the specified torque.
Tightening torque:
25 N·m (2.5 kgf-m, 18.1 ft-lb)
(A)
AT-00214
(A) Lock plate
4AT-111