420/500/520 Primary (clutch) Reduction 40%

  • Sale
  • Regular price $850.00
  • 2 available


The website automatically displays the more expensive billet basket option, use the option box above to choose the cheaper cast basket option.

**Price includes a $175 core charge on the aluminum clutch basket. Please send in your stock basket and include a copy of the original purchase receipt for the $175 core refund.

This is our billet 40% gear reduction for foot-shift and standard ES machines. DOES NOT FIT DCT (AUTO+ES) MODELS! We recommend running our stiffer stage 1 clutch springs with this reduction.

**ES models will need an ES module to prevent electronic shift issues. Springs, ES modules and seal kits are located in the 420/500/520 sections and "Parts" section of the site.