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SPD Tuning Service

   Clutch & Transmission
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Clutch & Transmission

We stock ACT clutch kits that are made from OEM Daikin parts. 30% stronger than stock. Not much to say except a big improvement!

Three "Turbo" transmission options are available with the following gear ratios. The "Ratios" column is the percentage difference in engine speed for each gear change 1-2, 2-3 etc. Even two percent differences in ratios are considered significant. You then must also examine the overall ratio of each gear by multiplying it by the final drive. If the ratios look similar, note that the overall gearing is not.

                    WRX 98            WRX-RA 98         WRX 96

First

3.166

   Ratios

3.083

   Ratios

3.454

 Ratios
Second

1.822

0.575

2.062

0.669

2.062

0.597
Third

1.296

0.711

1.545

0.749

1.448

0.702
Fourth

0.972

0.750

1.151

0.745

1.088

0.751
Fifth

0.783

0.806

0.825

0.717

0.825

0.758
Reverse

3.416

3.416

3.416
Final Drive

4.444

4.444

4.111

They are seldom available used.When available they are listed here. There is a fourth gear set, but it is so rare that it does not merit listing and the newer WRX-RA 98 is a better box.

The rear differential may need changed to use these transmissions depending on what model you have. They are easy to find and are $300-$450. These transmissions take turbo heavy duty clutch pressure plates as shown below. Note that non-RS owners must also purchase a pedal box and hydraulic cylinders.

Key Benefits

All these transmissions use high performance clutch components.
The 98 is a newly designed, very strong gearbox, ideal for heavy use.
The WRX 96 has taller 1st, and closer 1-2, 2-3 shifts compared to US gear boxes. It has a 3.39 final drive.  Best for autocross and open road compromise. RS box is similar.
The WRX 98 is a classic close ratio, open road gearbox with a 3.47 final drive. This gear box is designed for open road work. Keeps engine in torque band at higher speeds.
The WRX-RA 98 is a rally gear box. Recommended for rally and serious autocross only. The final drive ration is has a short 3.66 final and it will buzz the motor down the freeway..
Graphs of ratios compared to your current gearbox on request.

Pricing

Description SKU # Used New
ACT clutch assembly ACT01   $434
WRX 96 5-speed transmission TrWRX96 $950 $4125
WRX 98 close ratio 5-speed TrWRX98   $4625
WRX 98 Rally gear box TrWRXRA98   $4125
HD WRX Clutch Kit 700kg* ClWRX   $587
STI HD WRX Clutch Kit 950kg* ClSTI   $932
Pedal box, Hydraulic Conversion ClPedalBox $165  
Hydraulic Cylinders (pair less hose)     $178
Subaru 4.11 5 speed cable operated Tr411 $450  

* Either required for use with WRX transmissions. Includes required new flywheel, plate, disk and take out bearing. HD WRX unit good for most applications. STI recommended for 300+HP.

 

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Last modified: May 23, 2000