Subaru Legacy 2005 Service Manual page 2401

Drive Pinion Shaft Assembly
AUTOMATIC TRANSMISSION
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.
Tighten the lock plate (A) to specified torque.
Tightening torque:
⋅
25 N m (2.5 kgf-m, 18.4 ft-lb)
(A)
AT-01986
5AT-91