Subaru 2009 IMPREZA Service Manual page 1960

AUTOMATIC TRANSMISSION
9) Turn the drive pinion several times using ST1,
and check to see if the backlash is within the spec-
ification using ST2, ST3, ST4 and ST5.
ST1 499787700 WRENCH
ST2 498247001 MAGNET BASE
ST3 498247100 DIAL GAUGE
ST4 499787500 ADAPTER
ST5 498255400 PLATE
Backlash:
0.13 — 0.18 mm (0.0051 — 0.0071 in)
ST3
10) Adjust the teeth contact of the front differential
and drive pinion shaft. <Ref. to 4AT-95, ADJUST-
MENT, Drive Pinion Shaft Assembly.>
Front Differential Assembly
ST1
ST4
ST5
ST2
AT-00231
4AT-104