Coarse tooth custom helical 4th gear pair – 1.09 ratio. Suits all Evo 6-speed transmissions.

Worried you might blow 4th gear in your Evo 6-speed? Already done it? The weakest link in an otherwise sturdy gearbox, the OEM 4th gear is a common failure point with increased power and torque. These gears are drop in and much stronger – in fact, these will be the strongest gears in the gearbox instead of the weakest.

Coarser teeth are stronger and have better load bearing capacity.

Shot peened after heat treatment.

These gears will make extra noise compared to OEM due to their larger tooth module.