A method for controlling the pressure of hydraulic fluid supplied within a transmission of a work vehicle, the method comprising: - receiving a signal associated with a current load condition of the work vehicle; - determining a system desired pressure for the hydraulic fluid supplied within the transmission based on the current load condition, said transmission including an input shaft, a counter shaft and at least two driven shafts (34; 36, 38) extending parallel to the input and counter shafts; and - controlling a valve such that hydraulic fluid is supplied within the transmission at the desired pressure, wherein said determining comprises: - determining a first desired clutch pressure for a first clutch associated with the first driven shaft based on the current load condition; - determining a second desired clutch pressure for a second clutch associated with the second driven shaft based on the current load condition; and, - controlling clutch valves associated with the first and second clutches such that hydraulic fluid is supplied within the first clutch at the first desired clutch pressure and hydraulic fluid is supplied within the second clutch at the second desired clutch pressure; wherein the desired clutch pressure for the first and the second clutch generally corresponds to a minimum desired clutch pressure required at the current load condition to allow torque to be transmitted through the first and second clutch without causing it to slip, whereby the first and second clutch torque carrying capacity is calculated by a direct multiplication of - the total number of friction plates within the clutch, - a constant that is proportional to the friction coefficient of the friction plates - the working area of the friction plates and - the hydraulic pressure supplied within the clutch wherein determining the desired system pressure for the hydraulic fluid supplied within the transmission based on the first and second desired clutch pressures comprises setting the desired system pressure at a pressure above the greater of the first desired clutch pressure and the second desired clutch pressure. - receiving a signal associated with a current load condition of the work vehicle; - determining a system desired pressure for the hydraulic fluid supplied within the transmission based on the current load condition, said transmission including an input shaft, a counter shaft and at least two driven shafts (34; 36, 38) extending parallel to the input and counter shafts; and - controlling a valve such that hydraulic fluid is supplied within the transmission at the desired pressure, - determining a first desired clutch pressure for a first clutch associated with the first driven shaft based on the current load condition; - determining a second desired clutch pressure for a second clutch associated with the second driven shaft based on the current load condition; and, - controlling clutch valves associated with the first and second clutches such that hydraulic fluid is supplied within the first clutch at the first desired clutch pressure and hydraulic fluid is supplied within the second clutch at the second desired clutch pressure; - the total number of friction plates within the clutch, - a constant that is proportional to the friction coefficient of the friction plates - the working area of the friction plates and - the hydraulic pressure supplied within the clutch