Looking for the right transmission for your Subaru WRX in Perth? It can be a bit confusing with all the options out there. Whether you’re driving a daily commuter or a weekend warrior, getting the right gearbox is a big deal. This guide breaks down what you need to know about Subaru WRX transmission options available in Perth, from standard repairs to serious upgrades.
Key Takeaways
- Subaru Gearbox Australia has over 20 years of experience in repairing and rebuilding Subaru transmissions, including WRX models.
- They offer a wide range of services, from routine servicing and repairs to full gearbox rebuilds and reconditioning of transmissions and CVTs.
- Options include strengthening existing five-speed gearboxes, converting to six-speed STI transmissions, and high-performance billet motorsport transmissions.
- They stock a large inventory of exchange gearboxes and parts, catering to both DIY mechanics and professional workshops.
- Subaru Gearbox Australia provides technical support and has a network of fitting stations across Australia for trade customers.
1. Subaru Gearboxes – All You Need to Know
When you’re looking at transmissions for your Subaru WRX here in Perth, it’s good to know what’s what. Subaru has used a few different types over the years, and they all have their own quirks and strengths. Most WRXs came with a five-speed manual, which is pretty solid for daily driving and even some spirited runs. But if you’re pushing your car harder, or just want a different feel, there are other options.
The five-speed is known for being reliable, but it can get a bit worn out with age and hard use. We see a lot of them needing attention. Then there’s the six-speed STI transmission. This is a beefier unit, designed for more power and tougher conditions. Swapping one of these into a WRX that originally had a five-speed is a popular upgrade, and for good reason. It just feels more substantial and can handle more abuse.
It’s not just about the number of gears; it’s about how the whole system is put together. Things like the center differential, which manages power between the front and rear wheels, play a big role in how the car feels and performs, especially when you’re driving it hard.
We’ll get into the specifics of different conversions and upgrades later, but for now, just know that Subaru transmissions, whether they’re the standard five-speeds or the more robust STI six-speeds, can be serviced, repaired, and even upgraded to handle more than they did from the factory. It’s all about understanding what you have and what you want to achieve with your WRX.
2. Hybrid 6 Speed STI Conversion
So, you’ve got a Subaru WRX, maybe a Forester or Liberty, and you’re looking to step up the gearbox game. The 6-speed STI transmission is pretty much the gold standard for Subaru performance, and thankfully, it’s not just for STI models anymore. This conversion lets you ditch that older 5-speed and get into the much tougher and more engaging 6-speed box. It’s a popular choice, especially for people who like to push their cars a bit harder, and it’s seen some serious success in racing.
This upgrade makes your Subaru feel more connected and robust on the road. It’s generally rated to handle around 300 kilowatts at the wheels, which is a decent bump for most street cars. You can even get different gear ratios depending on what you’re after, whether it’s better acceleration or cruising.
When you go for this conversion, it usually comes as a complete package. That means you’re getting the 6-speed gearbox itself, along with the necessary rear differential, tailshaft, shifter, clutch kit, and all the other bits and pieces needed to make it fit your specific Subaru model. Sometimes, you can even opt to include brake and hub components if your setup needs them. It’s a pretty versatile upgrade that works for most Subarus that originally came with a 5-speed.
Getting the right parts and making sure everything fits correctly is key. It’s not just a simple swap; it involves integrating a whole new drivetrain setup.
If you’re thinking about this, it’s good to know that conversion gearboxes are often kept in stock, ready to be sent out. It really transforms the driving experience, making it feel more precise and capable.
3. Building a More Robust Five-Speed (Hybrid Spec II) for Street Use
So, the standard five-speed gearbox in many Subarus, especially the turbo models, can be a bit of a weak point. People often find that after some hard driving or when they start pushing more power through it, things like second and third gears can start to give up the ghost. It’s a common issue, and frankly, a bit of a bummer if you like to drive your car spiritedly. That’s where the Hybrid Spec II comes in. It’s basically a beefed-up version of the original five-speed, using a smart mix of stronger gears sourced from different Subaru models, both here and from Japan. The goal is to give you a gearbox that can handle a bit more grunt without breaking the bank or turning into a complete headache. It’s designed to be the toughest OEM-style five-speed you can get.
This setup is pretty neat because it lets you turn up the wick on your engine a little, maybe add some extra boost, and not have to worry quite so much about the gearbox suddenly deciding to call it quits. It’s all about finding that sweet spot between more power and keeping things reliable for everyday driving. Think of it as a sensible upgrade for street use, not necessarily for full-on track abuse, but definitely for when you want a bit more confidence in your drivetrain.
The Hybrid Spec II is a really practical solution for Subaru owners who want a bit more durability from their five-speed gearbox. It’s a clever way to use existing parts to create something stronger, making it a solid choice for daily drivers who occasionally like to push their car a bit.
It’s good to know that these upgraded boxes often come with a warranty, usually around 12 months, though that can depend on how you plan to use it. They’re generally ready to go, so you can get them shipped out pretty quickly. If you’re looking for something even tougher, for serious racing or track days, there are other options available, but for a robust street setup, the Hybrid Spec II is a really solid contender.
4. Billet Motorsport Transmissions
When you’re pushing your Subaru WRX hard, especially in competitive motorsport like rallying or drag racing, the standard gearbox just might not cut it. That’s where billet motorsport transmissions come in. These aren’t your everyday gearboxes; they’re built tough, using solid billet steel.
These transmissions are designed to handle serious abuse and significantly higher power outputs than stock units. They’re a collaboration between ADS and PPG, known for making some seriously strong stuff for racing applications. If you’re serious about performance and reliability under extreme conditions, this is the route to consider. They’re built for the long haul when you’re competing.
Billet motorsport transmissions are the go-to for drivers who demand the absolute best in durability and performance when the stakes are high. They’re engineered to withstand the rigors of intense motorsport.
| Feature | Benefit |
|---|---|
| Billet Steel | Increased strength and durability |
| Motorsport Grade | Designed for racing and high-stress use |
| PPG Collaboration | Proven engineering and manufacturing |
5. 6-Speed Parts
Finding the right parts for your Subaru’s 6-speed gearbox can sometimes feel like a treasure hunt, especially if you’re dealing with older or less common models. Many places don’t keep a lot of these specialized components on hand because there are so many different versions out there. It makes getting what you need quickly a real challenge.
We’ve worked hard to build up a solid stock of 6-speed STI parts, covering a wide range of variations, so you can get back on the road or track faster. We source parts both locally and internationally to make sure we have what you need.
Here’s a look at some of the common components we stock:
| Part Category | Examples |
|---|---|
| Housings | Turbo and non-turbo options |
| Gear Sets | Assembled and non-assembled sets |
| Differentials | Centre differentials (viscous coupling assemblies), front differential hemispheres |
| Bearings & Kits | All gearbox bearings, seal kits, gasket kits |
| Synchros & Hubs | Synchronizers, hubs, sliders, shift forks, shift rods |
| Hardware | Shims, nuts, bolts |
| Other | Speedo transducers, valve body assemblies (new and used) |
It’s not just about having the parts; it’s about knowing they’re the right ones for your specific setup. We can help you figure out exactly what you need, whether it’s for a standard rebuild or a more performance-oriented build.
6. Subaru Gearbox Repair or Rebuild
When your Subaru’s gearbox starts acting up, it’s not just an annoyance; it can really mess with your driving experience. Whether it’s a grinding noise, slipping gears, or something worse, getting it sorted is key. Many owners find that a professional repair or a full rebuild is the most sensible way to go. It’s not always about replacing the whole unit, especially if the core components are still in decent shape. A good mechanic can diagnose the specific issue, whether it’s worn bearings, damaged synchros, or a problem with the differential. They’ll figure out what parts need replacing and get your gearbox back to feeling smooth and reliable.
Diagnostics and Assessment
Parts and Support
Trade Services
Sometimes, the simplest fix is the best. Instead of trying to guess what’s wrong, a proper diagnostic check can save you time and money in the long run. It helps pinpoint the exact problem so the right repairs can be made, avoiding unnecessary work.
7. Subaru Transmission and CVT Reconditioning
When your Subaru’s transmission isn’t shifting right, or if you’re noticing strange noises, it might be time for a reconditioning. This process is all about bringing your gearbox back to its best, whether it’s a manual or an automatic, including those Continuously Variable Transmissions (CVTs) that Subaru uses in many models. Reconditioning involves a thorough inspection, cleaning, and replacement of worn-out parts. It’s not just a quick fix; it’s a detailed service to get your transmission performing reliably again.
CVTs, in particular, can be tricky. They use belts and pulleys instead of fixed gears, and when these wear out, you can feel it in the drive. Reconditioning a CVT often means replacing the belt, the pulleys, and the fluid, making sure everything is calibrated correctly. It’s a bit different from a standard automatic or manual gearbox, but the goal is the same: smooth operation.
What’s Involved in Reconditioning?
Reconditioning typically starts with taking the transmission apart. Every single piece is cleaned and checked for wear or damage. Seals and gaskets are always replaced because they’re cheap insurance against leaks. Depending on what’s found, other parts like bearings, clutches, or the torque converter might need replacing too. For CVTs, the focus is on the belt and pulley system, plus the control valve body.
Manual vs. Automatic vs. CVT Reconditioning
While the basic idea of reconditioning is similar across all types, the specific parts and procedures differ. Manual gearboxes might need synchros, bearings, or gear teeth repaired. Automatics involve clutch packs, valve bodies, and the torque converter. CVTs, as mentioned, focus on the belt, pulleys, and their associated control systems. Getting the right specialist is key, as they’ll know the specific needs of each type.
Why Choose Reconditioning Over Replacement?
Reconditioning is often a more budget-friendly option than buying a brand-new transmission. It can also be quicker, as you might be able to get your original unit rebuilt rather than waiting for a new one to be sourced. Plus, when done by a reputable shop, a reconditioned transmission can be just as reliable as a new one, sometimes even better if upgraded parts are used.
Signs Your Transmission Needs Attention
Listen for whining or clunking noises, feel for rough shifting or slipping gears, or notice any leaks under your car. If your CVT feels jerky or unresponsive, these are all signals that it’s time to look into reconditioning. Ignoring these signs can lead to more serious damage and higher repair costs down the line.
8. Motorsport Options
When you’re pushing your Subaru to its limits, whether that’s on the track or in a rally, you need a gearbox that can handle the abuse. We’re talking about serious performance here, not just your average daily driver stuff. For these kinds of applications, we partner with a top Australian maker called Pfitner, or PPG as they’re known. They make some seriously tough gear sets that have proven themselves in races all over the world.
PPG’s gear sets are known for their unique tooth designs. People say they’re really strong and don’t break easily, which is exactly what you want when you’re going flat out. They offer a few different types, depending on how much power you’re making, what you’re using the car for, and how much you want to spend.
Helical Synchronizer Mesh Gear Sets
These are pretty strong and work well for both street driving and when you’re hitting the drag strip. They offer a good balance of strength and usability.
Straight Cut Synchronizer Gear Sets
These are even stronger than the helical ones. They’re mostly for motorsport use, so if you’re serious about racing, these are a solid choice. They do make a bit more noise than helical gears, but that’s a small price to pay for the extra durability.
Straight Cut Dog Engagement Gear Sets
This is the toughest option available. It’s built for pure motorsport and is pretty much the strongest gearbox you can get. However, it’s only really suitable for racing applications because of how it engages. You won’t be shifting smoothly on your commute with these.
Choosing the right motorsport gearbox is all about matching the gear set to your specific needs. Think about the power you’re running, the type of racing you do, and your budget. Getting this right means your transmission will last longer and perform better when it counts.
We also have access to new and used parts, plus technical support from our gearbox specialists. They really know their stuff when it comes to Subarus and can help you figure out what you need and get it to you fast.
9. 5 to 6-Speed STI Conversions
Many Subaru owners with the older five-speed transmissions look to upgrade to the more robust and engaging six-speed STI gearbox. This conversion is a popular choice, especially for those who participate in motorsport, as the STI gearset has proven its strength and reliability in competition. It offers a more direct feel compared to the original five-speed and is generally rated for around 300 kilowatts at the wheels, though this can vary depending on the specific build and ratios chosen.
What’s Included in the Conversion
The complete package typically includes the six-speed gearbox itself, along with the necessary rear differential, tailshaft, shifter, and clutch kit. Depending on your specific Subaru model and the intended use, brake and hub components might also be part of the conversion. It’s designed to be adaptable for most Subaru models that originally came with a five-speed transmission.
Benefits of the 6-Speed STI Gearbox
The six-speed STI transmission is a significant step up in both strength and driving experience over the factory five-speed. It handles more power, feels more precise, and generally lasts longer, making it a worthwhile investment for enthusiasts looking to get more from their Subaru.
Upgrading to a six-speed STI gearbox can transform your driving experience, offering better performance and durability, especially if you plan on pushing your car harder or participating in track days.
10. Reverse Drive Transmission
Looking to put a Subaru gearbox into something that isn’t a Subaru? Maybe a VW, Porsche, or even a custom buggy project? That’s where the reverse drive transmission comes in. It’s basically a way to take that strong Subaru gearbox and make it work in a rear-wheel-drive setup.
This conversion is a smart move for anyone building a high-performance rear-drive vehicle that needs a reliable transmission. It allows you to pair the robust Subaru transaxle with powerful engines, giving you a solid foundation for your build. It’s not just about making it fit; it’s about making it handle the power you’re going to throw at it.
This setup is designed for owners of VWs, Porsches, and buggies who want to use Subaru gearboxes and transaxles with high-performance engines in a rear-wheel-drive configuration. It’s a specialized solution for unique vehicle builds.
Wrapping Up Your WRX Transmission Search
So, you’ve looked at the different ways to get your Subaru WRX transmission sorted out here in Perth. Whether you’re after a standard replacement, a beefed-up option for some fun driving, or even a full conversion, there are definitely specialists ready to help. Remember to check out places with a good track record and plenty of experience with Subarus specifically. Getting the right transmission means your WRX will keep performing the way it should, giving you peace of mind on the road.
