Installing a Limited Slip Differential in a Subaru Wrx: Step-by-step Guide

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Installing a limited slip differential (LSD) in your Subaru WRX can significantly enhance its performance, especially in terms of traction and handling. This guide will walk you through the step-by-step process to successfully install an LSD in your vehicle.

Tools and Materials Needed

  • Socket set
  • Torque wrench
  • Jack and jack stands
  • Limited slip differential
  • Gear oil
  • Sealant
  • Shop manual for your WRX model

Preparation Steps

Before starting the installation, it is essential to prepare your workspace and vehicle. Follow these steps:

  • Ensure the vehicle is parked on a flat surface.
  • Disconnect the battery to avoid any electrical issues.
  • Raise the vehicle using a jack and secure it with jack stands.
  • Remove the rear wheels for easier access to the differential.

Removing the Existing Differential

To install the new limited slip differential, you need to remove the existing one. Follow these steps:

  • Drain the differential oil by removing the drain plug.
  • Remove the bolts securing the differential cover and take off the cover.
  • Disconnect the axles from the differential by removing the axle nuts.
  • Unbolt the differential from its mounting points.
  • Carefully remove the differential from the housing.

Installing the Limited Slip Differential

Once the old differential is removed, you can proceed with the installation of the new limited slip differential:

  • Clean the differential housing to remove any old sealant or debris.
  • Apply sealant to the mating surface of the new LSD.
  • Carefully position the limited slip differential into the housing.
  • Secure the LSD to the mounting points with bolts and torque them to the manufacturer’s specifications.
  • Reconnect the axles to the differential and secure with axle nuts.
  • Replace the differential cover and secure it with bolts.

Filling with Gear Oil

After the installation, it’s crucial to fill the differential with the appropriate gear oil:

  • Locate the fill plug on the differential.
  • Using a funnel, fill the differential with the specified gear oil until it reaches the fill hole.
  • Replace the fill plug and ensure it is tight.

Final Steps

After filling the differential, follow these final steps to complete the installation:

  • Reinstall the rear wheels and lower the vehicle to the ground.
  • Reconnect the battery.
  • Start the vehicle and check for any leaks around the differential.
  • Take the car for a short test drive to ensure everything is functioning correctly.

Conclusion

Installing a limited slip differential in your Subaru WRX can greatly improve your driving experience. By following this step-by-step guide, you can ensure a successful installation and enjoy the enhanced performance that comes with it.