A variable force solenoid valve and a switching valve provide minimal line pressure disturbance in the output of an engine driven balanced hydraulic pump when switching between full flow and half flow in an automatic transmission. The variable force solenoid receives a signal from a transmission control module (TCM) or other electronic controller and provides controlled, pressurized hydraulic fluid (transmission oil) to a modulating binary switching or control valve that in a first position provides fluid flow from both outlet ports of the hydraulic pump to the line pressure regulator, modulates to reduce pressure and flow by returning a portion of the flow from one output port to an inlet port to match the requirements of the transmission between the first position and a second position and, in the second position, returns all flow from one of the pump outlet ports back to a suction or inlet port of the pump