Abstract: A transmission having a reverse mechanism for use in an automotive vehicle which includes a forward shift drum both ends of which are rotatably supported by an engine case, and a reverse shift drum concentrically arranged with the forward shift drum and relatively rotatably fitted to the peripheral surface of the forward shift drum. This transmission comprises a first rotation positioning mechanism provided on one end portion of the foward shift drum and adapted to regulate a rotary position of the drum, and a second rotation positioning mechanism provided on the reverse shift drum at an end portion thereof opposite to the one end portion and adapted to regulate a rotary position of the reverse shift drum. These first and second rotation positioning mechanisms are disposed at the outer side of the engine case respectively.

Abstract: An apparatus for attaching a transmission casing and a brake casing in a motorized three-wheeled vehicle having a rear wheel axle interconnecting between a pair of right and left rear wheels, and a transmission casing housing a final stage driving mechanism and a brake casing housing a brake mechanism provided around the axis of the axle, characterized in that the transmission casing and the brake casing are composed of respective sealed casings, and the two casings are disposed side by side leaving a space therebetween, and are combined together at circumferentially arranged plural positions with plural fastening bolts. The two casings are fixed to a vehicle body of the motorized three-wheeled vehicle by utilizing at least one of fastening bolts for combining the two casings together.