AUTOMATIC TRANSMISSION(4AT) > General Description

SPECIFICATION

1. TORQUE CONVERTER CLUTCH

Model

2.0 L DOHC

2.5 L SOHC

2.5 L Turbo

Type

Symmetric, 3 element, single stage,

2 phase torque converter

Stall torque ratio

2.0 — 2.2

2.05 — 2.35

Nominal diameter

236 mm (9.29 in)

246 mm (9.69 in)

Stall speed (at sea level)

2,100 — 2,600 rpm

2,200 — 2,700 rpm

2,800 — 3,300 rpm

One-way clutch

Sprag type one-way clutch

2. OIL PUMP

Type

Parachoid constant-displacement pump

Driving method

Driven by engine

Number of teeth

Inner rotor

9

Outer rotor

10

3. TRANSMISSION CONTROL ELEMENT

Type

4-forward, 1-reverse,

double-row planetary gears

Multi-plate clutch

3 sets

Multi-plate brake

2 sets

One-way clutch (sprag type)

1 set

4. TRANSMISSION GEAR RATIO

 

Gear ratio

1st

2.785

2nd

1.545

3rd

1.000

4th

0.694

Rev.

2.272

5. PLANETARY GEAR AND PLATE

Model

2.0 L DOHC

2.5 L SOHC

2.5 L Turbo

Number of front sun gear teeth

33

Number of front pinion teeth

21

Number of front internal gear teeth

75

Number of rear sun gear teeth

42

Number of rear pinion teeth

17

Number of rear internal gear teeth

75

Number of high clutch drive plates

4

5

Number of low clutch drive plates

5

7

Number of reverse clutch drive plates

2

Number of drive plates for the 2-4 brake

3

4

Number of drive plates for low & reverse brake

4

5

7

6. SELECTOR POSITION

P (Park)

Transmission is in neutral, output member is fixed, engine start is possible

R (Reverse)

Transmission is in reverse.

N (Neutral)

Transmission is in neutral and engine start is possible

D (Drive)

4-forward automatic gear change

1st 2nd 3rd 4th

SPORT mode

4-forward automatic gear change

1st 2nd 3rd 4th

Manual mode (+)

4-forward manual gear change (shift up)

1st → 2nd → 3rd → 4th

Manual mode (−)

4-forward manual gear change (shift down)

1st ← 2nd ← 3rd ← 4th

Control method

Wire cable type

7. HYDRAULIC CONTROL AND LUBRICATION

Type

Electronic hydraulic control [4 forward gear changes made by electronic signals of vehicle speed and accelerator (throttle) opening]

Fluid

Recommended materials

SUBARU ATF

Alternative

Idemitsu “ATF HP”

CAUTION:

Always use recommended or alternative products for the ATF. If those other than recommended or specified as alternatives are used, it will be a cause for problems. If the recommended ATF or alternative is difficult to obtain, it is possible to use DEXRON III as a temporary solution, but it is necessary to change to the specified ATF as soon as possible.

Fluid capacity

2.0 L DOHC model

8.4 — 8.7 L (8.9 — 9.2 US qt, 7.4 — 7.7 Imp qt)

2.5L SOHC model and 2.5 L turbo model

9.3 — 9.6 L (9.8 — 10.1 US qt, 8.2 — 8.4 Imp qt)

Lubrication system

Forced feed lubrication with oil pump

Oil

Automatic transmission fluid (see above)

8. COOLING AND HARNESS

Cooling system

2.0 L (non-turbo model)

2.0 L (Except for non-turbo models)

ATF warmer mounted directly on the transmission

Liquid-cooler incorporated in radiator

Inhibitor switch

12 poles

Transmission harness

20 poles

9. TRANSFER

Model

2.0 L DOHC

2.5 L SOHC

2.5 L Turbo

Transfer type

Multi-plate transfer (MP-T)

Number of transfer clutch drives & driven plates

4

5

6

Control method

Electronic hydraulic type

Lubricant

Same automatic transmission fluid as used in the automatic transmission

1st gear speed reduction gear ratio

1.000 (53/53)

10. FINAL REDUCTION GEAR

Model

2.0 L DOHC

2.5 L SOHC

2.5 L Turbo

Front final reduction gear ratio

4.111 (37/9)

4.444 (40/9)

4.111 (37/9)

11. RECOMMENDED GEAR OIL

Lubrication oil

(1)

Item

(3)

API standard

(2)

Front differential gear oil

(4)

SAE viscosity No. and applicable temperature

Front differential oil capacity

L (US qt, Imp qt)

1.1 — 1.3 (1.2 — 1.4, 1.0 — 1.1)