rearwardly extending hollow portion having a recess 32 at the rear end of the selector shaft 30 the u shaped detent spring 40 is also provided with a bight portion 44 which is restrained between tongue portions 29 struck out on the side wall 26 of the bracket 20 and the other end portion 46 which engages a stop lever 84 mounted on a shaft 85 between the rear and front walls of the bracket 20 and acts as one part of the counter stopping means to be described in more detailed hereinafter in order to drive the gear 70 from the selector shaft 30 the hub member 60 is provided with an outwardly extending taper portion 66 the taper face of which acts as a first clutch face having an annular outer surface which opposes close to an inwardly extending taper portion 36 of the selector shaft 30 the taper portion 36 acts as a second clutch face having an annular inner surface within the recess 32 of the selector shaft 30 each of surfaces has a coating layer 200 of lubricant materials such as of fluorine contained resin and or molybdemun disulfide the first and second clutch faces 66 and 36 are urged together by means of the bowed spring washer 80 which is positioned between the rear face of the front wall 24 of the bracket 20 and a flat washer 82 and which exerts a force to the selector shaft 30 so that the tapered end portion 62 of the hub member 60 is journaled in the opening formed in the rear wall 22 of the bracket 20 as described hereinbefore when the bowed spring washer 80 exerts a rear ward force.