As befits such a prestigious vehicle, the transmission shift system of the Jaguar XJ220 supercar requires ‘state-of-the-art’ performance, with particular emphasis on low effort, minimal travel and positive feel. To meet these targets, a high capacity triple-cone synchroniser is specified for both first and second gears. The design of this new synchroniser system is discussed, together with a review of the analysis, testing and development undertaken to achieve a successful and reliable solution. This success is measured by favourable vehicle reviews noting the ‘superb’ gearchange. Additionally, the reliability of the synchroniser system, and the transmission as a whole, was further demonstrated when an XJ220 won the GT class in the 1993 Le Mans 24 hours endurance race.