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Product Fitment:
2002-2007 Subaru WRX
2004-2007 Subaru STI
Tired of hearing clunks from the rear during hard shifts or throttle transitions? The Kartboy Rear Diff Bushing Kit (Soft) eliminates excessive rear differential movement in your Subaru by replacing the factory rubber bushings with high-durometer urethane. These soft bushings provide the perfect balance between stiffness and comfort—firming up the differential mount to improve throttle response while maintaining a smooth ride for daily driving.
Key Features:
Soft-durometer urethane construction that’s stiffer than OEM, yet more forgiving than race bushings
Reduces rear differential movement and helps eliminate clunks under acceleration and deceleration
Direct-fit upgrade using factory mounting locations; no major modifications required
Made in the USA with durable materials for long-lasting performance
Why Upgrade These Bushings?
Factory rubber differential bushings allow excess movement under load, leading to power loss, driveline lash, and unwanted clunking. By upgrading to Kartboy’s soft urethane bushings, you gain improved driveline stability, sharper response, and a more connected driving experience—all without harshness or vibration.
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