6XD SEQUENTIAL GEARBOX Worlds Strongest Sequential Transmission @ 1800+ftlbs. Delivered anywhere in the USA FREE! 6XD Modular Design Advantages. The 6XD Sequential Gearbox has what NO OTHER sequential Offers! 250+ ratios, replaceable dog-rings vs gears, independent shifter barrels, rotatable forks, (12) inputs, 6XD can be rotate 90* for lower crank centerline to the ground! 6XD Simplicity of Service. Swapping out drop-gears for longer-shorter overall stack in 8-10 minutes! Replaceable dog-rings/sliders in 15-20 minutes, rotating shift handle for exact location YOU want! 6XD Low Cost in Stock Items. 6XD is designed, engineered to have DOUBLE the life & STRENGTH regarding internal wear parts such as forks, shifter barrels, and gear sets!