Converting a 2005 Subaru WRX from Automatic to Manual Transmission: A Step-by-Step Guide

The Subaru WRX is a popular performance car known for its handling and power. While most WRX models come equipped with a manual transmission, some are sold with an automatic. If you own a 2005 WRX automatic and are looking to add a more engaging driving experience, converting it to a manual transmission can be a rewarding project.

Step 1⁚ Gather the Necessary Parts

Before you begin the conversion, you’ll need to gather the necessary parts. This includes⁚

• A complete manual transmission and drivetrain assembly (including clutch, flywheel, shifter, cables, and axles)
• A new ECU (Engine Control Unit) programmed for a manual transmission
• A new pedal assembly (including clutch pedal and brake booster)
• A manual transmission shifter boot and knob
• A set of manual transmission-specific axles
• A new wiring harness for the manual transmission
• Fluid for the transmission and differential
• Tools and supplies for the conversion

Step 2⁚ Preparation

Before you start working on the car, you’ll need to do some preparation. This includes⁚

• Jacking up the car and securing it on jack stands
• Disconnecting the battery to prevent any electrical issues
• Draining the transmission fluid and differential fluid
• Removing the wheels and tires

Step 3⁚ Remove the Automatic Transmission

Start by removing the automatic transmission. This will involve disconnecting the transmission lines, removing the bolts that secure the transmission to the engine, and disconnecting the driveshaft.

Step 4⁚ Install the Manual Transmission

Once the automatic transmission is removed, you can install the manual transmission. This process will involve aligning the transmission with the engine and bolting it in place. Make sure to torque the bolts to the correct specifications.

Step 5⁚ Install the Clutch and Flywheel

The clutch and flywheel are essential components of a manual transmission. You’ll need to install the new flywheel and clutch disc, ensuring that the pressure plate is properly aligned.

Step 6⁚ Connect the Driveshaft and Axles

After installing the transmission, you’ll need to connect the driveshaft and axles. This step involves aligning the driveshaft with the transmission and bolting it in place. Be sure to check the axles to ensure they are properly seated and secured.

Step 7⁚ Install the Pedal Assembly and Shifter

The pedal assembly and shifter are crucial for operating a manual transmission. You’ll need to install the new clutch pedal, brake booster, and shifter assembly. Make sure to adjust the clutch pedal height and the shifter linkage to ensure proper operation.

Step 8⁚ Connect the Wiring Harness

The wiring harness for the manual transmission needs to be connected to the ECU. You’ll need to carefully route the wiring harness and connect all the necessary wires. This step is important to ensure that the transmission is properly controlled by the ECU.

Step 9⁚ Reinstall the Wheels and Tires

Once you’ve completed the mechanical installation, you can reinstall the wheels and tires. Make sure to tighten the lug nuts to the correct torque specification.

Step 10⁚ Test Drive

After you’ve completed the installation, it’s time to test drive the car. Make sure to test the clutch engagement point and gear selection. You may need to make some adjustments to the shifter linkage or clutch pedal to ensure smooth shifting.

Conclusion

Converting your 2005 Subaru WRX from automatic to manual transmission can be a challenging but rewarding project. By following these steps and taking your time, you can enjoy a more engaging and exciting driving experience. If you’re not comfortable with the process, it’s always best to seek the help of a qualified mechanic. Always consult your owner’s manual for specific instructions and safety precautions related to your vehicle. Remember, safety is paramount, and you should never attempt any work on your car unless you are confident in your abilities and have access to the appropriate tools and equipment.