Subaru 2009 IMPREZA Service Manual page 1952

AUTOMATIC TRANSMISSION
5) Apply lead-free red dye evenly on the surface of
three to four teeth of the hypoid driven gear. Rotate
the drive pinion back and forward several times.
Remove the oil pump housing, and check the teeth
contact pattern.
If the teeth contact is inappropriate, adjust the
backlash or thickness of the shim. <Ref. to 4AT-
102, ADJUSTMENT, Front Differential Assembly.>
• Correct tooth contact
Check item: Tooth contact surface is slightly
shifted toward the toe side under a no-load con-
dition. (When driving, it moves towards the heel
side.)
(A) Toe side
(B) Heel side
• Face contact
Check item: Backlash is too large.
Contact pattern
Corrective action: Increase thickness of drive pin-
ion height adjusting washer in order to bring drive
pinion close to hypoid driven gear.
Drive Pinion Shaft Assembly
(A)
(B)
MT-01401
AT-00208
AT-00212
4AT-96
• Flank contact
Check item: Backlash is too small.
Contact pattern
Corrective action: Reduce the thickness of pinion
height adjusting washer according to the procedure
for bringing drive pinion away from hypoid driven
gear.
AT-00209
AT-00213