SUBARU 6-SPEED STI CONVERSIONS

ADS brings premium power transfer TO WRX, forester and LIBERTY

If you’ve got a 5-speed Subaru WRX, Liberty or Forester, especially if you’re interested in using your car in competitive motorsport events, you’re probably aware that the five speed box, although serviceable and easy to use, is not the strongest or best Subaru gearbox around. You might also have heard of the race and rally successes enjoyed by the 6-speed WRX STI, with its quick, strong, close ratio gearbox, and you could be forgiven for feeling a twinge of envy. The 6-speed STI box was designed by Subaru with motorsport in mind. It is by far the best and strongest gearbox Subaru have ever made, and with the highest level of operability. The six-speed gear set is nearly twice the size of the 5-speed and twice as strong. It can easily handle up to 300 Kw of power and a high degree of driver abuse.

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The six speed box (non-DCCD) was introduced in 2002 in the WRX STI, and revived interest in the Subaru brand. The STI still uses the 6-speed box, but since 2003, in DCCD version. Subaru are aware that in some ways this gearbox is the centrepiece of their premium performance models, and have invested considerable time and money into ongoing research and development. The six-speed DCCD gearbox has gone from strength to strength and has no known issues. The only problem is that this excellent gearbox only came in STI models, and if you wanted a super-strong competitive gearbox for your WRX, Forester GT/GX or Liberty GT, you had to turn to third party gear manufacturers.

Fortunately, it is relatively easy to retrofit the larger, stronger STI 6-speed gearbox to any of the 5-speed models, making it an ideal upgrade. However, there are some complicating internal factors, such as final drive ratios, and some DCCD issues. All Drive Subaru have spent considerable time researching solutions to these problems, and have come up with appropriate proprietary procedures and modifications to make the 6-speed gearbox work smoothly in your 5-speed model Subaru. The result is a kit to retrofit standard STI TY856 boxes to 5-speed models, using a fully remanufactured STI 6-speed, DCCD or non-DCCD, that will bolt straight into your WRX, Liberty GT or Forester GT/XT.

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All these transmission numbers start with TY856. Subsequent numbers identify which specific components are in the box. All the specialist techs at All Drive Subaroo are up to date on all gearbox variants and understand the numbering system fully. Our comprehensive knowledge means that you can be sure that an ADS supplied gearbox will be fully compatible with your Subaru, and that it can also be custom built for your specific needs, with different ratios as required.

Beware of Second hand conversions on the internet

All Drive Subaroo do not do conversions using second-hand boxes. There are a number of reasons for this. Six speed boxes from different models are not uniformly configured, raising the possibility of compatibility issues. Also, second hand boxes are an unknown quantity. If you are investing in a conversion of this nature, it usually means you want to keep the vehicle for a long time, and hope to get extended service out of the new gearbox. We stake our reputation on our reconditioned and remanufactured gearboxes.

There are several online sellers offering STI 6-speed conversions boxes using second-hand gearboxes and parts sourced either locally or from Japan. While these are certainly less expensive than our package kit, there are several pitfalls to look out for. For a start, you don’t really know what you’re getting; these might be high mileage boxes, despite claims to the contrary, and there may be other defects. For example, in our workshop, we see many 6-speed boxes that have worn hubs & sliders, synchros, and leaking seals. There are often issues with jumping out of fifth gear. In the end, a second hand box just might not give you good service and could prove to be a bad investment. There is also the strong possibility that the box, sourced from Japan or the US or Europe, will be incompatible with your Australian model, most commonly with speedometer readings, causing additional expense and stress. Also, when your second hand box needs repair it might be difficult to obtain compatible parts.

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