Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Impreza 2001-2002.2004-2007 Approved Subaru Impreza 2004 WRX STi 04. TRANSMISSION 02. AUTOMATIC TRANSMISSION 01. General Description
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GENERAL DESCRIPTION
AUTOMATIC TRANSMISSION
1. General Description 5. PLANETARY GEAR AND PLATE
A: SPECIFICATIONS Non-turbo
Model Turbo
Sedan Wagon
1. TORQUE CONVERTER CLUTCH
Tooth number of
33
front sun gear
Model Non-turbo Turbo
Tooth number of
Symmetric, 3 element, single stage, 21
Type front pinion
2 phase torque converter
Tooth number of
Stall torque 75
1.85 -- 2.15 2.05 -- 2.35 front internal gear
ratio
Tooth number of
Nominal 37 42
246 mm (9.69 in) rear sun gear
diameter
Tooth number of
Stall speed 19 17
2,100 -- 2,600 rpm 2,600 -- 3,400 rpm rear pinion
(at sea level)
Tooth number of
One-way 75
Sprague type one-way clutch rear internal gear
clutch
Drive plate num-
4 5
ber of high clutch
2. OIL PUMP
Drive plate num-
6 7
Type Paracoid constant-displacement pump ber of low clutch
Driving method Driven by engine Drive plate num-
ber of reverse 2
Inner rotor 9
Number of teeth clutch
Outer rotor 10
Drive plate num-
3 4
ber of 2-4 brake
3. TRANSMISSION CONTROL ELEMENT Drive plate num-
ber of low & 6 7
4-forward, 1-reverse,
Type reverse brake
double-row planetary gears
Multi-plate clutch 3 sets 6. SELECTOR POSITION
Multi-plate brake 2 sets
One-way clutch Transmission in neutral, output member
1 sets P (Park)
(sprague type) immovable, and engine start possible
R
4. TRANSMISSION GEAR RATIO Transmission in reverse for backing
(Reverse)
N (Neu- Transmission in neutral and engine start possi-
Sedan Except sedan tral) ble
Model
(Non-turbo) (Non-turbo)
Automatic gear change 1st 2nd 3rd
1st 3.027 2.785 D (Drive)
4th
2nd 1.619 1.545
3rd 1.000 Automatic gear change 1st 2nd 3rd
3 (3rd)
4th 0.694 4th
Rev 2.272 2nd gear locked (Deceleration possible 2nd
2 (2nd)
3rd 4th)
1st gear locked (Deceleration possible 1st
1 (1st)
2nd 3rd 4th)
Control
Hydraulic remote control
method
4AT-2
GENERAL DESCRIPTION
AUTOMATIC TRANSMISSION
7. HYDRAULIC CONTROL AND LUBRICA- 8. COOLING AND HARNESS
TION
Liquid-cooled cooler incorpo-
Cooling system
Electronic/hydraulic control [Four rated in radiator
forward speed changes by electri- Inhibitor switch 12 poles
Type
cal signals of vehicle speed and Transmission harness 20 poles
accelerator (throttle) opening]
Fluid Dexron III type 9. TRANSFER
9.3 -- 9.6 2 (9.8 -- 10.1 US qt,
Fluid capacity
8.2 -- 8.4 Imp qt) Model Non-turbo Turbo
Forced feed lubrication with oil Multi-plate transfer Variable torque
Lubrication system Transfer type
pump (MPT) distribution (VTD)
Automatic transmission fluid Drive & driven
Oil
(above mentioned) plate number of 5 3
transfer clutch
Control method Electronic, hydraulic type
The same Automatic transmission fluid
Lubricant
used in automatic transmission
1st reduction gear
1.000 (53/53)
ratio
10.FINAL REDUCTION
Model Except Sedan (Non-turbo) Sedan (Non-turbo)
Front final gear ratio 4.111 (37/9) 4.444 (40/9)
(1)
(2)
(3)
GL-5
(4)
( C) -30 -26 -15 -5 0 15 25 30
( F) -22 -15 5 23 32 59 77 86
Lubrication oil 90
85W
80W
80W -90
AT-00001
(1) Item (3) API classification
(2) Front differential gear oil (4) SAE viscosity No. and appli-
cable temperature
Front differential oil capacity 1.1 -- 1.3 2 (1.2 -- 1.4 US qt, 1.0 -- 1.1 Imp qt)
4AT-3
GENERAL DESCRIPTION
AUTOMATIC TRANSMISSION
B: COMPONENT
1. TORQUE CONVERTER CLUTCH AND CASE
(1)
(2)
(3) (4)
(15)
T2
(17)
T2
T2
(5)
(16)
(6)
(7)
(14)
(8)
T2 T1
T2
(13)
T3
(12) (9)
(10)
(11)
AT-01304
(1) Pitching stopper bracket (9) Input shaft (17) Harness stay (Non-turbo model)
(2) O-ring (10) O-ring
(3) Differential oil level gauge (11) Torque converter clutch ASSY Tightening torque: N◦ Jabse Service Manual Search 2026 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo