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This paper describes the functions and features of synchroniser system used in manual transmissions. It gives the details of the mathematical relationships involved in the synchroniser operation. A program is made in C to predict the gear shift effort required at the hand ball for a given manual transmission. The effect of various synchro parameters namely coefficient of friction, cone angle, blocker angle, synchronising time on gearshift quality and performance of manual transmission is studied. Benchmarking of a transmission, designed for usage with higher-powered engine, is carried out with proven transmissions in the same application.