Installation Guide: Replacing the Factory Differential with a Motive Powerbrake Lsd on a Subaru Wrx

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Replacing the factory differential with a Motive PowerBrake LSD on a Subaru WRX can significantly enhance the vehicle’s performance and handling. This guide provides a step-by-step process to ensure a successful installation.

Tools and Materials Needed

  • Socket set
  • Torque wrench
  • Jack and jack stands
  • Diff oil
  • New differential gasket
  • Sealant
  • Impact wrench (optional)
  • Safety glasses
  • Gloves

Preparation Steps

Before starting the installation, ensure that you have all the necessary tools and materials at hand. Additionally, make sure to work in a well-ventilated area and wear safety gear.

1. Secure the Vehicle

Begin by parking the Subaru WRX on a flat surface. Use the jack to lift the vehicle and secure it with jack stands. Ensure it is stable before proceeding.

2. Remove the Rear Wheels

Using the socket set, remove the lug nuts and take off the rear wheels. This will provide better access to the differential.

Removing the Factory Differential

With the wheels removed, you can now access the differential. Follow these steps to remove the factory unit.

1. Drain the Differential Fluid

Locate the drain plug on the differential and use a socket to remove it. Allow the fluid to fully drain into a suitable container.

2. Disconnect the Driveshaft

Remove the bolts connecting the driveshaft to the differential. Carefully slide the driveshaft out of the way.

3. Unbolt the Differential

Remove the bolts securing the differential to the rear subframe. Keep track of these bolts, as you will need them for the new differential.

4. Remove the Differential

Carefully lower the factory differential from the vehicle. It may be helpful to have a second person assist with this step.

Installing the Motive PowerBrake LSD

Now that the factory differential is removed, you can install the Motive PowerBrake LSD. Follow these steps for proper installation.

1. Prepare the New Differential

Before installation, ensure that the Motive PowerBrake LSD is clean and free from any debris. Apply a small amount of differential oil to the gears to lubricate them.

2. Position the New Differential

Carefully lift the new differential into place. Align it with the mounting points on the rear subframe.

3. Secure the Differential

Using the bolts you previously removed, secure the new differential to the rear subframe. Ensure that they are tightened to the manufacturer’s specifications using a torque wrench.

4. Reconnect the Driveshaft

Slide the driveshaft back into position and reconnect it to the differential using the bolts. Again, ensure they are tightened properly.

5. Fill with Differential Fluid

Replace the drain plug if you removed it earlier. Fill the differential with the recommended fluid until it reaches the proper level.

Final Steps

After installing the Motive PowerBrake LSD, there are a few final steps to complete.

1. Reinstall the Rear Wheels

Place the rear wheels back onto the hubs and secure them with the lug nuts. Ensure they are tightened properly.

2. Lower the Vehicle

Carefully lower the vehicle back to the ground and remove the jack stands.

3. Test Drive

Take the Subaru WRX for a test drive to ensure everything is functioning correctly. Listen for any unusual noises and check for leaks.

Conclusion

Replacing the factory differential with a Motive PowerBrake LSD can greatly improve your Subaru WRX’s handling and performance. By following this guide, you can successfully complete the installation and enjoy the benefits of enhanced traction and stability.