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A higher versatility is required from medium size bulldozers as vehicles other than large size bulldozers. Therefore the design concept of the transmission for medium size bulldozers has to be changed to that of large size bulldozers. We adopted combination of high capacity torque convertor and low reduction (high output speed) cross ratio gear train for medium size bulldozers' transmission. We also evaluated the advantages and disadvantages of rotating clutches, and decided not to use the rotating clutches in new transmission for medium size bulldozers, because of their disadvantages. By these design concepts and material technology, we can reduce the transmission size and improve the efficiency.