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The paper is dedicated to design of a new dog-clutch gearshift mechanism for passenger car gearboxes with external synchronization. There are two main targets of presented work: 1 Replace the standard synchronizer with cheap and compact shift device, which will keep the internal architecture of classical manual transmission. 2 Keep all the other important functions of synchronizer: a minimal circular backlash to avoid clash during change of sense of the torque flow, b prevent unwanted disengagement, c guarantee the shift anytime, d determine neutral position (preferably). Czech Technical University in Prague is for several years active in the field of design and testing of shift mechanisms, as well as in design of new shift clutches. The currently presented clutch is 3rd generation of inventions of dog clutch systems. All clutches were fabricated as prototype and tested. All designs will be briefly described in the paper.