once the tractor has come to rest or to a predetermined ground speed one or more clutches would be applied to place the transmission in the desired gear for movement in the opposite direction step 110 and pressure is released from the f2 clutch step 112 while pressure is maintained in clutch r next the pressure supplied to clutch r by the mc2 proportional valve is modulated or increased to achieve a gradual and controlled acceleration of the tractor in the new direction step 114 again a feed back loop might be used to control the acceleration rate of the tractor referring now to fig4 a shuttle shift from a gear in the reverse range to a gear in the forward low range is accomplished as follows first all the clutches are unlocked step 120 then sufficient current is applied to the mc2 proportional valve which controls the pressure to clutches f2 and r to drop the pilot pressure to a pressure just sufficient to cause initial clutch engagement for example approximately 50 psig step 122 next this pilot pressure is applied to the f2 and r clutches step 124 since clutch r possesses a torque advantage relative to the output clutch r will lock up and clutch f2 will slip then the pressure supplied to clutches f2 and r by the mc2 proportional valve is modulated or increased to achieve a gradual and controlled deceleration of the tractor for example a feed back loop might be used to adjust the pressure applied to clutches f2 and r as a function.