The Broadsport 5-speed gearbox kit. This gearbox has brand new components (not reconditioned). The unique design of direct bolt-on case gives this kit the very best and easiest way of upgrading a transmission. Fifth gear is 0.73:1 ratio, i.e. similar to an overdrive gear. After 4 years of development and testing (see our gallery page, Martyn Reeves XK140 ‘Rally des Alpes’ 2007 – 2500 miles round trip with no problems) We now have what we believe is the very best gearbox replacement on the market, exclusively developed for Broadsport and capable of handling up to 300 BHP. Contact us at Guy Broad for more information and spec sheet on this Broadsport Gearbox or for further information on any of our XK parts or XK performance upgrades.