Kartboy Manual Transmission Shifter Assembly

Kartboy Manual Transmission Shifter Assemblies: The Original American-Made Short Shifter

When it comes to manual transmission shifter assemblies, few names carry as much weight in the Subaru community as Kartboy. Born in a San Diego machine shop in 1999, Kartboy was founded by Tom Deadrick — an aerospace fabricator with hands-on experience in CART, NHRA, SCCA, and IMSA motorsport. Frustrated by the vague, imprecise feel of stock Subaru shifters, he began engineering his own solutions, and the result became one of the most respected short shifter lines in the enthusiast world.

What Sets Kartboy Shifter Assemblies Apart

Kartboy's manual transmission shifter assemblies are built from CNC-machined and TIG-welded 4130 chromoly steel — a material best known for its use in aerospace and motorsport applications — and are manufactured in the USA. This construction translates directly into a shift lever that can withstand the rigors of both daily driving and track use without flex or slop.

The defining performance benefit is a 40% reduction in shift throw, paired with a shifter height that sits approximately 30% lower than the factory shift knob position. Rather than offering gimmicky adjustability, Kartboy designs each lever to deliver an optimized throw and height right out of the box — a philosophy backed by years of real-world tuning feedback from the Subaru community.

Shifter Assembly Lineup: Coverage Across the Subaru Family

Kartboy's shifter assembly offerings span decades of Subaru manual transmission applications. Notable fitments include:

• Subaru STI 6-Speed (2004–2021): The Short Shifter Kit includes the shifter arm and replacement shift linkage bushings, pre-assembled for easy plug-and-play installation.
• Subaru WRX 5-Speed (2008–2014), Legacy GT, Outback XT, and Forester (2006–2013): Available as a standalone lever or as a combo kit bundled with front and rear polyurethane shifter bushings.
• Subaru Impreza RS / WRX (1997–2007): The original shifter that built the Kartboy reputation — available in narrow and wide pivot variants to match different factory shifter configurations.
• 2015+ WRX Cable-Shift Transmission: Kartboy has extended its short shifter lineup to cover the modern cable-actuated WRX platform for a shorter throw and tighter gate feel.

For owners of the 6-speed STI platform, Kartboy also offers the Solid Shift Joint — a precision-machined stainless steel replacement for the factory rubber-isolated U-joint in the shift linkage. The OEM rubber joint wears over time and absorbs shift input rather than transmitting it cleanly; Kartboy's solid unit features press-fit bronze bushings and stainless crush tubes for a bind-free, direct connection that complements any short shifter upgrade.

A Shifter System Engineered to Work Together

What distinguishes Kartboy's approach is the philosophy of treating the shifter system as a whole. The combination of a short shifter lever, polyurethane front and rear bushings, and a solid shift joint delivers a shift feel that is dramatically tighter and more communicative than any single component upgrade alone. The result is crisp, defined gear changes without the harshness or notchiness that can plague lesser aftermarket assemblies.

With over 25 years of proven performance and a lifetime guarantee on their products, Kartboy manual transmission shifter assemblies remain the benchmark for Subaru short shifter upgrades.