Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 416
MANUAL TRANSMISSION AND
DIFFERENTIAL
6MT
Page
General Description . . . . . . . . . . . . . . . . . . . . ...2
Transmission Gear Oil . . . . . . . . . . . . . . . . . . . .26
Oil Seal . . . . . . . . . . . . . . . . . . . . . . . . . .27
Differential Side Retainer Oil Seal . . . . . . . . . . . . . . . 28
Transmission Mounting System . . . . . . . . . . . . . . . ...29
Manual Transmission Assembly . . . . . . . . . . . . . . . ..31
Preparation for Overhaul . . . . . . . . . . . . . . . . . . ..37
Air Breather Hose . . . . . . . . . . . . . . . . . . . . . .38
Back-up Light Switch . . . . . . . . . . . . . . . . . . . . 39
Neutral Position Switch . . . . . . . . . . . . . . . . . . . 41
Extension Case . . . . . . . . . . . . . . . . . . . . . . 43
Reverse Check System . . . . . . . . . . . . . . . . . . . 50
Transfer Drive Gear . . . . . . . . . . . . . . . . . . . . .53
Transfer Driven Gear . . . . . . . . . . . . . . . . . . . ...55
Center Differential . . . . . . . . . . . . . . . . . . . . . 57
Transmission Case . . . . . . . . . . . . . . . . . . . . ..58
Main Shaft Assembly . . . . . . . . . . . . . . . . . . . ...65
Driven Gear Assembly . . . . . . . . . . . . . . . . . . . .80
Reverse Idler Gear Assembly . . . . . . . . . . . . . . . . ..89
Drive Pinion Shaft Assembly . . . . . . . . . . . . . . . . . 94
Front Differential Assembly . . . . . . . . . . . . . . . . . 100
Shifter Fork and Rod . . . . . . . . . . . . . . . . . . . ..107
Clutch Housing . . . . . . . . . . . . . . . . . . . . . ...121
Driver’s Control Center Differential Control Module . . . . . . . ...123
General Diagnostic Table . . . . . . . . . . . . . . . . . ...124
6MT-2
General Description
MANUAL TRANSMISSION AND DIFFERENTIAL
1. General Description
A: SPECIFICATION
1. MANUAL TRANSMISSION AND FRONT DIFFERENTIAL
2. TRANSMISSION GEAR OIL
Recommended oil:
GL-5 (75W-90) or equivalent
Type
6-forward speeds and 1-reverse
Transmission gear ratio
1st
3.636
2nd
2.235
3rd
1.521
4th
1.137
5th
0.971
6th
0.756
Reverse
3.545
Front reduction
gear
Final
Type of gear
Hypoid
Gear ratio
3.900
Rear reduction
gear
Transfer
Type of gear
Helical
Gear ratio
1.103
Final
Type of gear
Hypoid
Gear ratio
3.545
Front differential
Type and number of gear
Planetary gear (pinion gear: 8, gear: 2)
LSD type
Helical
Center differential Type and number of gear
Planetary gear
(Internal gear: 1, pinion gear: 6, sun gear: 1, and solenoid compression
variable control multiplate clutch)
Transmission gear oil
GL-5
Transmission gear oil capacity
4.1 L (4.3 US qt, 3.6 Imp qt)
6MT-3
General Description
MANUAL TRANSMISSION AND DIFFERENTIAL
B: COMPONENT
1. CLUTCH HOUSING
(1)
Gasket
(7)
Oil seal
Tightening torque: N·m (kgf-m, ft-lb)
(2)
Plug
(8)
Clutch release bearing guide
T1: 6.4 (0.7, 4.7)
(3)
Pitching stopper bracket
(9)
Return spring bracket
T2: 41 (4.2, 30.2)
(4)
Clip
(10) Plug
T3: 50 (5.1, 36.9)
(5)
Clutch housing
(11) Drain plug
T4: 70 (7.1, 51.6)
(6)
Gasket
(12) Transmission radio ground cable
T5: 46 (4.7, 33.9)
MT-02307
(5)
(6)
(7)
(8)
T3
T4
T1
(4)
(3)
(2)
(9)
T2
(12)
(1)
(10)
(11)
T5
6MT-4
General Description
MANUAL TRANSMISSION AND DIFFERENTIAL
2. ADAPTER PLATE
(1)
Breather hose
(7)
O-ring
Tightening torque: N·m (kgf-m, ft-lb)
(2)
Check plug
(8)
Checking spring
T1: 18 (1.8, 13.3)
(3)
O-ring
(9)
Check ball
T2: 25 (2.5, 18.4)
(4)
Checking spring
(10) Oil guide A
T3: 50 (5.1, 36.9)
(5)
Plunger
(11) Oil guide B
(6)
Check plug
(12) Adapter plate
MT-02308
(2)
(3)
(1)
(4)
(6)
(5)
(7)
(8)
(9)
(12)
T2
T1
T3
T2
T1
(11)
T1
(10)
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