Subaru Legacy IV (2008 year). Service manual - part 688

4AT-100

Front Differential Assembly

AUTOMATIC TRANSMISSION

5) Rotate the drive pinion a few times using ST1
and ST2.
ST1

498937110

HOLDER

ST2

499787700

WRENCH

6) Tighten the LH differential side retainer by rotat-
ing the shaft until resistance is felt. Then loosen the
RH side differential side retainer. Tighten the LH
differential side retainer until the pinion shaft no
longer turns, and continue to loosen the RH side.
This is the “zero” state.

7) After reaching the “zero” state, loosen the LH dif-
ferential side retainer by 3 notches and secure it
with the lock plate. Then after returning the RH dif-
ferential side retainer, retighten until it stops. Ro-
tate the drive pinion 2 or 3 times. Tighten the RH
differential side retainer further by 1-3/4 notches.
This sets the preload. Finally, secure the differen-
tial side retainer with the lock plate.

NOTE:
Turning the differential side retainer by one notch
changes the backlash approx. 0.05 mm (0.0020 in).

8) Install the Subaru genuine axle shafts to the right
and left sides of the front differential.
Install the axle shaft to both sides of the front differ-
ential section.
Part No.

38415AA000

Axle shaft

(A) Differential side retainer

AT-00206

ST2

ST1

AT-00229

(A)

(A) Lock plate

AT-00214

(A)

0.05 mm
(0.0020 in)

AT-00230

4AT-101

Front Differential Assembly

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)

10) Adjust the teeth contact of the front differential
and drive pinion shaft. <Ref. to 4AT-92, ADJUST-
MENT, Drive Pinion Shaft Assembly.>

AT-00231

ST5

ST3

ST2

ST1

ST4

4AT-102

AT Main Case

AUTOMATIC TRANSMISSION

34.AT Main Case

A: REMOVAL

1) Remove the transmission assembly from vehicle
body. <Ref. to 4AT-35, REMOVAL, Automatic
Transmission Assembly.>
2) Pull out the torque converter clutch assembly.
<Ref. to 4AT-67, REMOVAL, Torque Converter
Clutch Assembly.>
3) Remove the input shaft.

4) Lift up the lever on the rear side of transmission
harness connector, and then disconnect it from the
stay.
5) Disconnect the inhibitor switch connector from
the stay.
6) Disconnect the air breather hose.
7) Remove the oil charge pipe. <Ref. to 4AT-66,
REMOVAL, Oil Charge Pipe.>
8) Remove the ATF inlet and outlet pipes. <Ref. to
4AT-62, REMOVAL, ATF Cooler Pipe and Hose.>
9) Separate the converter case from the transmis-
sion case. <Ref. to 4AT-80, REMOVAL, Converter
Case.>
10) Remove the oil pump housing.
<Ref. to 4AT-83, REMOVAL, Oil Pump Housing.>
11) Take out the high clutch, thrust needle bearing
and reverse clutch assembly.

12) Take out the high clutch hub and thrust bear-
ing.

13) Take out the front sun gear and thrust needle
bearing.

14) Pull out while being careful not to break the leaf
spring of the 2-4 brake.

(A) High clutch and reverse clutch ASSY

(B) Thrust needle bearing

AT-00114

AT-00232

(B)

(A)

(A) High clutch hub

(B) Thrust needle bearing

(A) Front sun gear

(B) Thrust needle bearing

(A) Leaf spring

(B) Retaining plate

AT-00233

(A)

(B)

AT-00251

(A)

(B)

AT-00252

(A)

(B)

4AT-103

AT Main Case

AUTOMATIC TRANSMISSION

15) Remove the snap ring and thrust needle bear-
ing.

16) Take out the retaining plate, drive plate and
driven plate of the 2-4 brake.

17) Take out the thrust needle bearing, planetary
gear assembly and low clutch assembly.

18) Remove the 2-4 brake seal.

19) Remove the snap ring.

20) Take out the 2-4 brake spring retainer.

21) Remove the 2-4 brake piston and 2-4 brake
piston retainer while taking care not to damage
them.

(A) Snap ring

(B) Thrust needle bearing

AT-00253

(A)

(B)

AT-00254

AT-00255

AT-04848

(A) Snap ring

(B) 2-4 brake piston

(A) 2-4 brake piston

(B) 2-4 brake piston retainer

AT-00285

(B)

(A)

AT-00286

AT-00287

(A)

(B)