1997 SUBARU LEGACY differential

H3M1180A
B: IDENTIFICATION
When replacing a rear differential assembly, select the cor-
rect one according to the following table.
CAUTION:
Using the different rear differential assembly causes
the drive line and tires to “drag” or emit abnormal
noise when AWD is selected.
Gear ratio Part number Stamp on rear differential
2200 cc
MT3.900 27011AA330
B3M0124
2200 cc
AT
4.111 27011AA340
B3M0127
2500 cc
MT
2500 cc
AT4.444 27011AA410
B3M0421
3
3-4SPECIFICATIONS AND SERVICE DATA
1. AWD System

1. Rear Differential Mounting System
B3M0517A

1Plate


2Crossmember


3Rear bushing


4Differential mount lower bracket


5Differential mount bracket (OUTBACK model)


6Differential mount bracket


7Boss (OUTBACK model)


8Stopper (OUTBACK model)


9Stopper


10Front bushing


11Dynamic damper (2500 cc MT model)


12Differential mount front cover

13Differential front member
Tightening torque: N⋅m (kg-m, ft-lb)
T1: 20±5 (2.0±0.5, 14.5±3.6)
T2: 32±8 (3.3±0.8, 23.9±5.8)
T3: 64±8 (6.5±0.8, 47.0±5.8)
T4: 69±8 (7.0±0.8, 50.6±5.8)
T5: 69±10 (7.0±1.0, 51.0±7.2)
T6: 88±10 (9.0±1.0, 65.0±7.2)
T7: 98±10 (10.0±1.0, 72.0±7.2)
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3-4COMPONENT PARTS
1. Rear Differential Mounting System

2. Propeller Shaft
G3M1018

1Front propeller shaft


2Center bearing


3Companion flange


4Stake nut


5Rear propeller shaft


6Rear differential
Tightening torque: N⋅m (kg-m, ft-lb)
T1: 27.9±4.4 (2.85±0.45, 20.6±3.3)
T2: 31±8 (3.2±0.8, 23.1±5.8)
T3: 52±5 (5.3±0.5, 38.3±3.6)
T4: 270±25 (27.5±2.5, 199±18)
7
3-4COMPONENT PARTS
2. Propeller Shaft

3. Rear Differential Assembly
B3M0130A

1Pinion crown gear set


2Pinion height adjusting washer


3Rear bearing


4Bearing preload adjusting spacer


5Bearing preload adjusting washer


6Differential carrier


7Front bearing


8Spacer


9Pilot bearing


10Front oil seal


11Companion flange


12Self-locking nut


13Side bearing


14O-ring

15Side bearing retainer shim


16Side bearing retainer


17Side oil seal


18Side gear thrust washer


19Side gear


20Pinion mate gear


21Pinion mate gear washer


22Pinion shaft lock pin


23Circlip


24Pinion mate shaft


25Air breather cap


26Stud bolt


27Oil filler plug


28Oil drain plug

29Rear cover


30Differential case
Tightening torque: N⋅m (kg-m, ft-lb)
T1: 10.3±1.5
(1.05±0.15, 7.6±1.1)
T2: 29.4±4.9
(3.00±0.50, 21.7±3.6)
T3: 44.1±3.9
(4.50±0.40, 32.5±2.9)
T4: 103.0±9.8
(10.50±1.00, 75.9±7.2)
T5: 181.4±14.7
(18.50±1.50, 133.8±10.8)
8
3-4COMPONENT PARTS
3. Rear Differential Assembly

G3M0021
6) Remove front exhaust cover.
G3M0022
7) Remove differential mount front cover.
G3M0782
8) Remove the four bolts which hold propeller shaft to rear
differential.
NOTE:
Put matching mark on affected parts before removal.
Remove all but one bolt.
G3M0024
9) Remove the two bolts which hold center bearing to
vehicle body.
G3M0025
10) Remove propeller shaft from transmission.
CAUTION:
Be sure not to damage oil seals and the frictional sur-
face of sleeve yoke.
NOTE:
Be sure to use an empty oil can to catch oil flowing out
when removing propeller shaft.
Be sure to plug the opening in transmission after
removal of propeller shaft.
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3-4SERVICE PROCEDURE
1. Propeller Shaft

G3M0027
4) Align matching marks and connect front and rear pro-
peller shafts.
Tightening torque:
27.9±4.4 N⋅m (2.85±0.45 kg-m, 20.6±3.3 ft-lb)
G3M0024
F: INSTALLATION
1) Insert sleeve yoke into transmission and attach center
bearing to vehicle body.
Tightening torque:
52±5 N⋅m (5.3±0.5 kg-m, 38.3±3.6 ft-lb)
G3M0782
2) Align matching marks and connect flange yoke and rear
differential.
Tightening torque:
31±8 N⋅m (3.2±0.8 kg-m, 23.1±5.8 ft-lb)
G3M0022
3) Install differential mount front cover.
Tightening torque:
88±10 N⋅m (9.0±1.0 kg-m, 65±7 ft-lb)
G3M0021
4) Install front exhaust cover.
5) Install rear exhaust pipe and muffler.
13
3-4SERVICE PROCEDURE
1. Propeller Shaft

2. Rear Differential
A: ON-CAR SERVICE
1. FRONT OIL SEAL
1) Disconnect ground cable from battery.
2) Move selector lever or gear shift lever to“N”.
3) Release the parking brake.
B3M0316A
4) Remove oil drain plug, and drain gear oil.
G3M0024
5) Jack-up rear wheels and support the vehicle body with
sturdy racks.
6) Remove propeller shaft from body. [W1B0].>
CAUTION:
Wrap metal parts with a cloth or rubber material to
prevent damage from adjacent metal parts.
G3M0034
7) Remove self-locking nut while holding companion
flange with ST.
ST 498427200 FLANGE WRENCH
G3M0035
8) Extract companion flange with a puller.
14
3-4SERVICE PROCEDURE
2. Rear Differential

G3M0036
9) Remove oil seal using ST.
ST 499705401 PULLER ASSY
G3M0037
10) Fit a new oil seal using ST.
ST 498447120 OIL SEAL INSTALLER
G3M0034
11) Install companion flange.
12) Tighten self-locking nut within the specified torque
range so that the turning resistance of companion flange
becomes the same as that before replacing oil seal.
ST 498427200 FLANGE WRENCH
CAUTION:
Use a new self-locking nut.
Tightening torque:
181.4±14.7 N⋅m (18.50±1.50 kg-m, 133.8±10.8 ft-lb)
13) Reassembling procedure hereafter is the reverse of
the disassembling.
15
3-4SERVICE PROCEDURE
2. Rear Differential