The Samsonas Motorsport E46 Dogbox Gearkit is designed to fit into the original E46 5-Speed ZF S5D Housing. This gearkit features a new surface and profile big teeth, as well as a clutch shaft made from special driveshaft steel. With straight cut forged steel gears, racers will notice minimum rolling resistance. Each Samsonas gearbox features super finished, shot-peened gears and internals for optimal quality, and all selectors, shifting fingers, protections, forks, and rods are made from billet steel for maximum reliability. These gearboxes are suitable for: Rally Endurance Racing Time Attack Rallycross Circuit Hill Climb 4-Speed Ratios I 2,615 II 1,938 III 1,563 IV 1,316 5-Speed Ratios I 2,400 2,067 2,643 II 1,789 1,600 1,850 III 1,429 1,300 1,300 IV 1,174 1,110 1,110 V 1,000 1,000 1,000