A synchronised shift device for locked connection of at least two shafts whereby the shafts have different rotation speeds at the start of a shift procedure, comprising: a. a first shaft; b. a first annular drive body (36, 38) coaxially and fixedly mounted on the first shaft and having a plurality of teeth on a radial outer surface thereof; c. a synchronisation body rotatably mounted on the first shaft adjacent the first annular body (36, 38); d. a first annular coupling element rotatably mounted relative to the first annular drive body (36, 38) and driveably engageable therewith, said coupling element having a plurality of teeth on a radial outer surface thereof; e. a synchronisation sleeve disposed about the first annular drive body (36, 38), synchronisation body and first annular coupling element, the sleeve having teeth on an inner surface thereof and being slidable in an axial direction of the first shaft from a first disengaged position, through an intermediate position wherein the teeth of the sleeve engage the teeth of the first annular coupling element and thereby drive engagement of the first annular coupling element and first annular drive body (36, 38), to an engaged position wherein the teeth of the sleeve engage the teeth of the drive body (36, 38); f. a second shaft having external gearing over a part of the length thereof, said external gearing being in driving engagement with gearing on a part of the inner surface of the synchronisation sleeve in all positions of the synchronisation sleeve; g. a third shaft coaxially and rotatably disposed about the first shaft; h. a second annular drive body coaxially and fixedly mounted on the third shaft adjacent the synchronisation body and having a plurality of teeth on a radial outer surface thereof; and i. a second annular coupling element rotatably mounted relative to the second annular drive body and driveably engageable therewith, said second annular coupling element having a plurality of teeth on a radial outer surface thereof; wherein the synchronisation sleeve is slidable through a second intermediate position wherein the teeth of the sleeve engage the teeth of the second annular coupling element and thereby drive engagement of the second annular coupling element and second annular drive body, to a second engaged position wherein the teeth of the sleeve engage the teeth of the second annular drive body. a. a first shaft; b. a first annular drive body (36, 38) coaxially and fixedly mounted on the first shaft and having a plurality of teeth on a radial outer surface thereof; c. a synchronisation body rotatably mounted on the first shaft adjacent the first annular body (36, 38); d. a first annular coupling element rotatably mounted relative to the first annular drive body (36, 38) and driveably engageable therewith, said coupling element having a plurality of teeth on a radial outer surface thereof; e. a synchronisation sleeve disposed about the first annular drive body (36, 38), synchronisation body and first annular coupling element, the sleeve having teeth on an inner surface thereof and being slidable in an axial direction of the first shaft from a first disengaged position, through an intermediate position wherein the teeth of the sleeve engage the teeth of the first annular coupling element and thereby drive engagement of the first annular coupling element and first annular drive body (36, 38), to an engaged position wherein the teeth of the sleeve engage the teeth of the drive body (36, 38); f. a second shaft having external gearing over a part of the length thereof, said external gearing being in driving engagement with gearing on a part of the inner surface of the synchronisation sleeve in all positions of the synchronisation sleeve; g. a third shaft coaxially and rotatably disposed about the first shaft; h. a second annular drive body coaxially and fixedly mounted on the third shaft adjacent the synchronisation body and having a plurality of teeth on a radial outer surface thereof; and i. a second annular coupling element rotatably mounted relative to the second annular drive body and driveably engageable therewith, said second annular coupling element having a plurality of teeth on a radial outer surface thereof;