Upshift in hydrostatic drive work machine

A method of upshifting in a hydrostatic drive work machine is provided. The method includes the step of adjusting a high clutch pressure of the work machine toward an elevated pressure. While adjusting the high clutch pressure, a motor displacement in a hydrostatic drive of the work machine is increased toward a predetermined motor displacement. A hydrostatic drive work machine is also provided, including a control module having a computer readable medium with a control algorithm recorded thereon. The control algorithm includes first means for controlling motor displacement based on throttle position of the work machine, and second means for controlling motor displacement based on a factor other than throttle position.