Abstract: Dog clutch with locking synchronization for gear shifts, wherein a synchronizer body (1) and a gear (2) turning with a different rotational speed are coupled together form-lockingly with the aid of an axially displaceable, annularly shaped sliding sleeve (3) when synchronized, whereby an inner toothing (31) of the sliding sleeve (3) engages in one respective external toothing (11, 12) of the synchronizer body (1) and the gear (2) with a locking pin and or plunger (4) located between the synchronizer body (1) and the sliding sleeve (3), which in the uncoupled stage engage in a recess (32) on the inside of the sliding sleeve (3) and have axially displaceable compression surfaces (41) which cooperate with the compression surfaces (51) on the synchro ring (5, 6) arranged between synchronizer body (1) and the gear (2), whereby at least two synchro rings (5, 50; 6, 60) are mutually connected via entrainment devices (52, 520; 62, 620) and are in entrainment connection with the synchronizer body (1) in both circumfer