Rear Differential Positive Power Kit Inserts

• 2009–2018 Subaru | Forester XT
• 2008–2021 Subaru | WRX
• 2008–2021 Subaru | WRX STI
• 2010-2012 Subaru | Legacy GT
• 2015-2019 Subaru | Outback
• 2012-2016 Subaru | Impreza

The Whiteline Rear Differential Positive Power Kit Inserts are rear differential mount insert bushings for Subaru WRX, WRX STI, Legacy GT, Forester XT, Outback and Impreza models, designed to reduce the rear differential movement that causes the clunk heard during shifts. The inserts work within the voids of the original factory bushings, so there is no need to remove the original bushings, while delivering an improved gear shift, reduced initial torque loss and greater power transfer to the wheels.

• Part Number: KDT903
• Fitment: 2008-2025 Subaru WRX, 2008-2021 Subaru WRX STI, 2010-2012 Subaru Legacy GT, 2009-2018 Subaru Forester XT, 2015-2019 Subaru Outback and 2012-2016 Subaru Impreza
• Position: Rear differential mount, in cradle
• Function: Insert bushings fill the voids in the factory differential mount bushings to reduce differential movement during acceleration and deceleration
• Includes: Differential mount inserts, all necessary hardware for installation, a grease packet and instructions; installs with simple hand tools

Frequently Asked Questions

• Q: Do these differential inserts fit my WRX or STI?
  A: Yes — KDT903 fits 2008-2025 Subaru WRX and 2008-2021 Subaru WRX STI models, plus the Legacy GT, Forester XT, Outback and Impreza applications listed in the fitment information.
• Q: What is included in the box?
  A: The kit includes the rear differential mount inserts, all necessary hardware for installation, a grease packet and instructions.
• Q: Do the factory bushings need to be removed?
  A: No — the inserts are designed to work within the voids of the original factory bushings, so the original bushings do not need to be removed.

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