Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 489
DIFFERENTIALS
DI
Page
General Description . . . . . . . . . . . . . . . . . . . . ...2
Differential Gear Oil . . . . . . . . . . . . . . . . . . . . ..18
Front Differential Assembly . . . . . . . . . . . . . . . . . ..21
Rear Differential (T-type) . . . . . . . . . . . . . . . . . . ..22
Rear Differential Front Oil Seal . . . . . . . . . . . . . . . . 54
Rear Differential Side Oil Seal . . . . . . . . . . . . . . . . .56
Rear Differential Front Member . . . . . . . . . . . . . . . . 57
Rear Differential Mount Bushing . . . . . . . . . . . . . . . ..58
General Diagnostic Table . . . . . . . . . . . . . . . . . . .62
DI-2
General Description
DIFFERENTIALS
1. General Description
A: SPECIFICATION
1. REAR DIFFERENTIAL
When replacing a rear differential assembly, select the correct one according to the following table.
NOTE:
Using a different rear differential assembly will cause the drive train and tires to drag or emit abnormal noise.
2. IDENTIFICATION
Identification positions are shown in the following
figures. For details concerning identification, refer
to the “ID” section.
3. REAR DIFFERENTIAL GEAR OIL
Recommended gear oil:
GL-5 (75W-90)
Alternative:
Equivalent product
CAUTION:
• If an alternative product is used, you may not
have expected functionality and performance.
• Each oil manufacturer has its base oil and ad-
ditives. Thus, do not mix two or more brands.
Model
2.5 L high power turbo
2.5 L turbo
6MT
5MT
Rear differential type
T-type
Identification
H3
B2
LSD type
Torsen
—
Type of gear
Hypoid gear
Gear ratio (Number of gear teeth)
3.545 (39/11)
3.900 (39/10)
Oil capacity
1.0 L (1.1 US qt, 0.9 Imp qt)
0.8 L (0.8 US qt, 0.7 Imp qt)
Rear differential gear oil
GL-5
(1) Identification
(1)
DI-00502
(1) Item
(2) Rear differential gear oil
(3) API classification
(4) SAE viscosity No. and applicable temperature
(1)
(4)
GL-5
(3)
(2)
( C)
( F)
-30
-15
15
90
75W -90
30
0
-22
32
86
59
5
MT-03000
DI-3
General Description
DIFFERENTIALS
4. SERVICE DATA
5. ADJUSTING PARTS
• T-type (B2)
Drive pinion bearing
preload (For new
bearing)
Measured with spring measurement (Measured at
companion flange bolt hole) N (kgf, lbf)
T-type (B2)
18.1 — 38.8 (1.8 — 4.0, 4.1 — 8.7)
T-type (H3)
24.1 — 38.6 (2.5 — 3.9, 5.4 — 8.7)
Measured with torque wrench N·m (kgf-m, ft-lb)
T-type (B2) 0.69 — 1.47 (0.07 — 0.15, 0.51 — 1.08)
T-type (H3) 0.98 — 1.57 (0.10 — 0.16, 0.72 — 1.16)
Side gear backlash
mm (in) T-type (B2)
0.10 — 0.20 (0.004 — 0.008)
Side bearing standard width
mm (in)
20.00 (0.7874)
Hypoid driven gear to drive pinion backlash
mm (in)
0.10 — 0.20 (0.004 — 0.008)
Hypoid driven gear runout on its back surface
mm (in)
0.05 (0.002)
Companion flange mating surface runout
mm (in)
0.08 (0.003)
Companion flange runout on its inner surface
mm (in)
0.08 (0.003)
Total preload (Measured from the companion flange bolt
hole)
N (kgf, lbf)
T-type (B2)
20.7 — 54.4 (2.1 — 5.5, 4.7 — 12.2)
T-type (H3)
26.5 — 53 (2.7 — 5.4, 6.0 — 11.9)
Part No.
Length mm (in)
Preload adjusting spacer
383695201
56.2 (2.213)
383695202
56.4 (2.220)
383695203
56.6 (2.228)
383695204
56.8 (2.236)
383695205
57.0 (2.244)
383695206
57.2 (2.252)
Part No.
Thickness mm (in)
Preload adjusting washer
383705200
2.59 (0.1020)
383715200
2.57 (0.1012)
383725200
2.55 (0.1004)
383735200
2.53 (0.0996)
383745200
2.51 (0.0988)
383755200
2.49 (0.0980)
383765200
2.47 (0.0972)
383775200
2.45 (0.0965)
383785200
2.43 (0.0957)
383795200
2.41 (0.0949)
383805200
2.39 (0.0941)
383815200
2.37 (0.0933)
383825200
2.35 (0.0925)
383835200
2.33 (0.0917)
383845200
2.31 (0.0909)
DI-4
General Description
DIFFERENTIALS
Pinion height adjusting washer
383495200
3.09 (0.1217)
383505200
3.12 (0.1228)
383515200
3.15 (0.1240)
383525200
3.18 (0.1252)
383535200
3.21 (0.1264)
383545200
3.24 (0.1276)
383555200
3.27 (0.1287)
383565200
3.30 (0.1299)
383575200
3.33 (0.1311)
383585200
3.36 (0.1323)
383595200
3.39 (0.1335)
383605200
3.42 (0.1346)
383615200
3.45 (0.1358)
383625200
3.48 (0.1370)
383635200
3.51 (0.1382)
383645200
3.54 (0.1394)
383655200
3.57 (0.1406)
383665200
3.60 (0.1417)
383675200
3.63 (0.1429)
383685200
3.66 (0.1441)
Side gear thrust washer
383445201
0.75 — 0.80 (0.0295 — 0.0315)
383445202
0.80 — 0.85 (0.0315 — 0.0335)
383445203
0.85 — 0.90 (0.0335 — 0.0354)
Side retainer shim
383475201
0.20 (0.0079)
383475202
0.25 (0.0098)
383475203
0.30 (0.0118)
383475204
0.40 (0.0157)
383475205
0.50 (0.0197)
Part No.
Thickness mm (in)
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