Tighten Up Your Shift Feel with the GrimmSpeed 6-Speed STI Shifter Bushing Kit

Mar 12, 2026

For many STI drivers, the connection between driver and drivetrain is a huge part of the experience. Crisp shifts, precise gear engagement, and a solid mechanical feel are what make the STI platform so rewarding to drive. Over time, however, the factory shifter components can start to wear, and one of the most common sources of that looseness is the factory rubber shifter bushings.

The new GrimmSpeed 6-Speed STI Shifter Bushing Kit was designed to solve exactly that problem. By replacing the aging rubber bushings with durable polyurethane components, this kit tightens up the shifter assembly and restores the precise shift feel STI drivers expect.

Why Factory Shifter Bushings Wear Out

The factory shifter bushings on the STI are made from rubber, which works well when the car is new but naturally softens and degrades over time. Heat cycles, drivetrain movement, and general wear can cause these bushings to compress and lose their original shape.

As this happens, excess movement is introduced into the shifter linkage. The result is a shift feel that becomes less precise, with additional play between gears. Drivers often notice the shifter feeling loose or less connected to the transmission compared to when the car was newer.

Replacing those worn rubber bushings is one of the most effective ways to bring back that original shift feel.

A Simple Upgrade with a Big Impact

The GrimmSpeed 6-Speed STI Shifter Bushing Kit replaces both the front and rear shifter bushings to stabilize the entire assembly. The front bushings are constructed from 90A durometer polyurethane to minimize flex and reduce movement in the linkage. The rear bushing uses an 80A durometer compound that maintains durability while keeping the car comfortable for daily driving.

Together, these bushings significantly reduce shifter slop and deliver a tighter, more confident feel between gears.

To ensure long term durability, the bushings incorporate precision machined 304 stainless steel inserts that help distribute load and resist corrosion. The kit also includes zinc coated hardware for a secure and reliable installation.

Built for the Subaru Community

Like all GrimmSpeed products, this kit was designed with the Subaru community in mind. While the shifter bushings may be a small component in the drivetrain, the difference they make in driving feel is immediately noticeable. For STI owners looking to eliminate sloppy shifting and restore a more direct connection to the transmission, the GrimmSpeed 6-Speed STI Shifter Bushing Kit is a simple and effective solution.