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Allis-Chalmers has introduced a new Power Shift transmission to be utilized in its New Family of agricultural tractors in the 136-161 hp (101-120 kw) class. This optional transmission, utilizing both countershaft and planetary gearing, heavy duty, wet disc clutches and a uniquely designed control system provides twelve forward and two reverse vehicle speeds when coupled with the standard range transmission. Qualities of durability, safety and low noise emission of the Models 7040 and 7060 tractors are further enhanced by smooth power shifting, providing additional operator convenience and performance.