Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 395
MANUAL TRANSMISSION AND DIFFEREN-
TIAL
5MT
Page
General Description . . . . . . . . . . . . . . . . . . . . ...2
Transmission Gear Oil . . . . . . . . . . . . . . . . . . . .22
Manual Transmission Assembly . . . . . . . . . . . . . . . ..23
Transmission Mounting System . . . . . . . . . . . . . . . ...29
Oil Seal . . . . . . . . . . . . . . . . . . . . . . . . . .31
Differential Side Retainer Oil Seal . . . . . . . . . . . . . . . 32
Switches and Harness . . . . . . . . . . . . . . . . . . . .33
Preparation for Overhaul . . . . . . . . . . . . . . . . . . ..34
Transfer Case and Extension Case Assembly . . . . . . . . . . .35
Transfer Drive Gear . . . . . . . . . . . . . . . . . . . . .41
Transfer Driven Gear . . . . . . . . . . . . . . . . . . . ...43
Center Differential . . . . . . . . . . . . . . . . . . . . . 45
Reverse Check Sleeve . . . . . . . . . . . . . . . . . . . .46
Transmission Case . . . . . . . . . . . . . . . . . . . . ..49
Main Shaft Assembly for Single-Range . . . . . . . . . . . . ...53
Drive Pinion Shaft Assembly . . . . . . . . . . . . . . . . . 58
Front Differential Assembly . . . . . . . . . . . . . . . . . ..69
Reverse Idler Gear . . . . . . . . . . . . . . . . . . . . ...77
Shifter Fork and Rod . . . . . . . . . . . . . . . . . . . . 79
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)
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