Cusco’s Close Ratio Gear Set brings 1st and 2nd gear ratio closer to the 3rd gear for competition and sport driving performance. The gears are designed and tested per each vehicle application characteristics and are also able to withstand the stress of a tuned race driveline.Each gear tooth is “nished” (precision shaving) to provide strength and additional noise prevention. Heat treatment as well as WPC can be applied to areas that have the most stress applied.