Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 395

MANUAL TRANSMISSION AND DIFFEREN-

TIAL

5MT

Page

1.

General Description  ...................................................................................2

2.

Transmission Gear Oil  .............................................................................22

3.

Manual Transmission Assembly  ..............................................................23

4.

Transmission Mounting System  ...............................................................29

5.

Oil Seal .....................................................................................................31

6.

Differential Side Retainer Oil Seal ............................................................32

7.

Switches and Harness  .............................................................................33

8.

Preparation for Overhaul ..........................................................................34

9.

Transfer Case and Extension Case Assembly .........................................35

10.

Transfer Drive Gear  .................................................................................41

11.

Transfer Driven Gear  ...............................................................................43

12.

Center Differential  ....................................................................................45

13.

Reverse Check Sleeve .............................................................................46

14.

Transmission Case  ..................................................................................49

15.

Main Shaft Assembly for Single-Range  ...................................................53

16.

Drive Pinion Shaft Assembly ....................................................................58

17.

Front Differential Assembly  ......................................................................69

18.

Reverse Idler Gear ...................................................................................77

19.

Shifter Fork and Rod  ................................................................................79

20.

General Diagnostic Table .........................................................................83

5MT-2

General Description

MANUAL TRANSMISSION AND DIFFERENTIAL

1. General Description

A: SPECIFICATION

1. MANUAL TRANSMISSION AND DIFFERENTIAL

2. TRANSMISSION GEAR OIL

Recommended oil:

GL-5 (75W-90) or equivalent

Model

Turbo model

Type

5-forward speeds and 1-reverse (all stage with synchromesh)

Transmission gear ratio

1st

3.166

2nd

1.882

3rd

1.296

4th

0.972

5th

0.738

Reverse

3.333

Front reduction 
gear

Final

Type of gear

Hypoid

Gear ratio

3.900

Rear reduction 
gear

Transfer

Type of gear

Helical

Gear ratio

1.000

Final

Type of gear

Hypoid

Gear ratio

3.900

Front differential

Type and number of gear

Straight bevel gear (bevel pinion: 2, bevel gear: 2)

Center differential Type and number of gear

Straight bevel gear (bevel pinion: 2, bevel gear: 2 and viscous coupling)

Transmission gear oil

GL-5

Transmission gear oil capacity

3.5 L (3.7 US qt, 3.1 Imp qt)

5MT-3

General Description

MANUAL TRANSMISSION AND DIFFERENTIAL

B: COMPONENT

1. TRANSMISSION CASE

(1)

Transmission case ASSY

(5)

Harness clip

Tightening torque: N·m (kgf-m, ft-lb)

(2)

Gasket

(6)

Pitching stopper bracket

T: 44 (4.5, 32.5) (Aluminum gasket, 

silver)

(3)

Drain plug

(7)

Oil level gauge

 

70 (7.1, 51.6) (Copper gasket, 
brown)

(4)

Harness bracket

(8)

Transmission radio ground cord

 

70 (7.1, 51.6) (Metal gasket, 
black)

MT-02724

T

(3)

(1)

(2)

(7)

(6)

(8)

(5)

(4)

5MT-4

General Description

MANUAL TRANSMISSION AND DIFFERENTIAL

Transmission case tightening torque

Bolt No.

Bolt size

mm

Tightening torque: N·m (kgf-m, ft-lb)

(5) — (15)

8

25 (2.5, 18.4)

(1) — (4)

(16), (17)

10

39 (4.0, 28.8)

MT-00003

(9)

(5)

(7)

(16)

(17)

(3)

(4)

(11)

(1)

(2)

(6) (8)

(10)

(12)

(14)

(13)

(15)