Whiteline KDT903 Positive Power Kit Rear Differential Mount Inserts for Select Subaru 2004-2025

Fits select 2004-2025 Subaru Forester, Impreza, WRX, STI, Legacy, Outback, and XV Crosstrek.

The Whiteline KDT903 Positive Power Kit is engineered to reduce drivetrain slop by filling the voids within the original factory differential mounting bushings. By stabilizing the differential, these inserts maintain proper pinion angles and minimize initial torque loss, resulting in improved gear shift feel and more direct power transfer to the wheels.

These inserts are manufactured from a high-quality synthetic elastomer, offering superior resistance to oil, grease, ozone, and environmental weathering compared to standard rubber. Designed as a supplemental upgrade rather than a full replacement, the KDT903 inserts install directly into factory housing voids, making it an efficient solution for performance street or track use without the need for a hydraulic press.

• Maintains pinion angles for reduced torque loss and improved drivetrain response
• Synthetic elastomer formulation provides high resistance to oils and weathering
• Internal grease reservoirs facilitate continuous self-lubrication
• Includes extreme pressure molybdenum disulphide (LM) based grease for extended service life
• Easy-install design works with existing factory bushings
• Manufacturer Part Number: KDT903