How To Instal Gear Box Into 1998 Gc8 Wrx

How to Install Gear Box into 1998 GC8 WRX

Are you a proud owner of a 1998 GC8 WRX and looking to install a new gear box? Look no further! In this step-by-step guide, we will walk you through the process of installing a new gear box into your beloved 1998 GC8 WRX. With a few tools and a little bit of patience, you can successfully complete this installation yourself and get your car back on the road in no time.

Gather the Necessary Tools

Before you begin, make sure you have all the required tools. Here’s a list of what you’ll need:

  • Socket wrench set
  • Screwdriver set
  • Torque wrench
  • Jack and jack stands
  • Wheel chocks
  • Gear box
  • New transmission fluid
  • Gasket and seals

Prepare Your Work Area

Prior to starting the installation, it is crucial to prepare your work area. Begin by securing your vehicle on a level surface and engage the parking brake. Place wheel chocks behind the rear wheels to prevent any accidental rolling. Next, lift the front of your GC8 WRX using a jack and secure it on jack stands for stability during the installation process. Ensure you’re working in a well-lit area and have enough room to maneuver comfortably.

Remove the Old Gear Box

The next step is to remove the old gear box from your 1998 GC8 WRX:

  1. Locate the transmission drain plug and drain the old fluid into a suitable container. Dispose of the old fluid responsibly.
  2. Disconnect the negative battery cable to prevent any electrical mishaps.
  3. Disconnect all electrical connectors, linkages, and hoses connected to the gear box.
  4. Remove the rear drive shaft and front drive shafts.
  5. Safely disconnect the gear box from the engine block, ensuring you have proper support to prevent it from falling.
  6. Carefully lower the old gear box from your GC8 WRX using a transmission jack.

Install the New Gear Box

Now it’s time to install the new gear box into your 1998 GC8 WRX:

  1. Position the new gear box onto the transmission jack and carefully raise it into place.
  2. Attach the gear box to the engine block, ensuring proper alignment.
  3. Reconnect all electrical connectors, linkages, and hoses to the gear box.
  4. Install the front and rear drive shafts.
  5. Torque all fasteners to their specified values using a torque wrench.

Refill with Transmission Fluid

With the new gear box successfully installed, it’s time to refill it with fresh transmission fluid:

  1. Locate the transmission fluid dipstick and remove it.
  2. Using a funnel, carefully pour the recommended transmission fluid into the dipstick tube. Refer to your vehicle’s manual for the appropriate fluid type and quantity.
  3. Once filled, reinsert the dipstick and ensure it is secured properly.

Final Checks and Test Drive

Before taking your GC8 WRX for a spin, perform a final inspection:

  1. Ensure all connections and fasteners are tight and secure.
  2. Double-check that the fluid levels are within the recommended range.
  3. Start your vehicle and let it idle for a few minutes, checking for any leaks or abnormal noises.
  4. Once satisfied, take your 1998 GC8 WRX for a short test drive to assess the gear box’s performance.


Congratulations! You have successfully installed a new gear box into your 1998 GC8 WRX. By following these instructions and taking the necessary precautions, you can complete this installation yourself. Remember, if you feel uncomfortable or unsure at any point during the process, it’s best to seek professional assistance. Embrace the satisfaction of knowing you tackled this project and enjoy the improved performance of your beloved GC8 WRX.

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