Dual power flow counter shaft transmission

A powershift transmission for a work vehicle is disclosed having two modes of applying power: a direct connection through a series of gears, and a connection through a torque converter integral with the transmission. The two paths branch at the input shaft, on which is mounted and which drives a torque converter that has a gear coupled to its output. Another gear on the input shaft is connected to that shaft by a hydraulic clutch. When the clutch is engaged, the transmission provides several high-range forward gear ratios through a direct gear drive. When that clutch is disconnected, the torque converter supplies power to the transmission to low forward and low reverse ranges of gear ratios. The transmission includes a first countershaft, on which are mounted a reverse master clutch engaged in all reverse gear ratios) and a forward low range clutch, which is engaged in the low range of forward gear ratios. The reverse master clutch couples the countershaft directly to the output shaft. The forward low-range clutch connects the countershaft to a second countershaft. The second countershaft and the output shaft each has two speed clutches. Only one of these speed clutches is engaged in any individual gear ratio. The output shaft is also engaged to a mechanical front wheel drive output shaft via a clutch. This output shaft is engaged via that clutch and counter-rotates with the output shaft to drive the front wheels or tracks of the vehicle.