Subaru Legacy BN/BS (2015-2019) Service Manual: Specification

Subaru Legacy BN/BS (2015-2019) Service Manual / Differentials / General description / 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.

• For option code, refer to “ID” section.

Model	Sedan			OUTBACK
	2.5 L		3.6 L	2.5 L		3.6 L
	CVT	6MT	CVT	CVT	6MT	CVT
Rear differential type	VA1-type	T-type	VA2-type	VA1-type	T-type	VA2-type
Identification	Y2	B1	Y4	Y3	B4	Y4
LSD type	—
Type of gear	Hypoid gear
Gear ratio (number of gear teeth)	3.900 (39/10)	4.111 (37/9)	4.111 (37/9)	4.111 (37/9)	4.444 (40/9)	4.111 (37/9)
Oil capacity	0.8 L (0.8 US qt, 0.7 Imp qt)
Rear differential gear oil	GL–5 (75W–90)

2. IDENTIFICATION

Identification positions are shown in the following figures. For details concerning identification, refer to the “ID” section.

• T-type

(1)	Identification

• VA1-type

(1)	Identification

• VA2-type

(1)	Identification

3. REAR DIFFERENTIAL GEAR OIL

Recommended gear oil:

GL–5 (75W–90) or equivalent

CAUTION:

Each oil manufacturer has its base oil and additives. Thus, do not mix two or more brands.

(1)	Item
(2)	Rear differential gear oil
(3)	API classification
(4)	SAE viscosity No. and applicable temperature

4. SERVICE DATA

Drive pinion bearing preload (for new bearing)	Measured with spring measurement (measured from the companion flange bolt)	N (kgf, lbf)	T-type	18.1 — 38.8 (1.8 — 4.0, 4.1 — 8.7)
			VA1, VA2-type	12.7 — 32.2 (1.3 — 3.3, 2.9 — 7.2)
	Measured with torque wrench	N·m (kgf-m, ft-lb)	T-type	0.69 — 1.47 (0.07 — 0.15, 0.51 — 1.08)
			VA1, VA2-type	0.48 — 1.22 (0.05 — 0.12, 0.35 — 0.90)
Side gear backlash	mm (in)		T-type	0.10 — 0.20 (0.004 — 0.008)
			VA1-type	0.05 — 0.15 (0.002 — 0.006)
			VA2-type	0.13 — 0.18 (0.005 — 0.007)
Hypoid driven gear backlash	mm (in)		T-type	0.10 — 0.20 (0.004 — 0.008)
			VA1, VA2-type	0.10 — 0.15 (0.004 — 0.006)
Hypoid driven gear runout on its back surface	mm (in)		T-type	0.05 (0.002)
Total preload (measured from the companion flange bolt hole)	N (kgf, lbf)		T-type	20.7 — 54.4 (2.1 — 5.5, 4.7 — 12.2)
Companion flange mating surface runout			mm (in)	0.08 (0.003)
Companion flange runout on its inner side			mm (in)	0.08 (0.003)

Caution

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