Rear Differential Positive Power Kit

The Whiteline KDT903 Rear Differential Positive Power Kit is engineered to enhance drivetrain performance by minimizing rear differential movement during acceleration and deceleration. This method provides a significant reduction in unwanted compliance without the need for complete OEM housing removal, offering a more straightforward installation than a full bushing replacement kit like the KDT906. This kit is specifically designed for the GR chassis platform, covering the 2008-2014 Subaru WRX, STI, and the 2009-2013 Forester. Its insert-based design makes it a suitable option for mounts that are in good condition but exhibit normal wear and tear, allowing enthusiasts to achieve substantial benefits with less installation complexity. The KDT903 is part of a broader GR drivetrain mount improvement package, designed to work in conjunction with other Whiteline components such as front differential mount inserts (KDT905) and transmission mount inserts (KDT956). Whiteline, an Australian company founded in 1979, is dedicated to developing suspension components that deliver measurable improvements in handling, stability, and tire contact. Their products, including polyurethane bushings, are developed using advanced engineering techniques and validated through track testing. The RallySport Take highlights that this kit offers an effective and easy-to-install improvement, emphasizing the importance of thorough cleaning and proper greasing of contact surfaces during installation for optimal results. The difference in drivetrain feel is immediately noticeable upon hard acceleration post-installation.