Hydrostatic clutch system and method for making power under acceleration

A hydrostatic clutch system comprising:

• a hydraulic pump having a pump housing with openings therein, and a manifold/end cover, wherein the hydraulic pump is an axial piston pump comprising a plurality of pistons and having a cylinder block;
• a hydraulic fluid circuit wherein the hydraulic fluid circuit is interconnected to high and low pressure inlet ports and an outlet port in the manifold/end cover, wherein the manifold/end cover is coupled to the hydraulic pump, wherein the fluid circuit also includes at least one fluid control valve in operable communication with the outlet port for creating backpressure in the pump;
• a valve to selectively control flow through the inlet ports in the end cover;
• at least one gear set or transmission,
• an input shaft in communication with the hydraulic pump, and
• input shaft lockup members including lockup plates with each said lockup plate having flanges attached to and spaced along a perimeter of the respective lockup plate, wherein one or more of the lockup plates are movably disposed face to face with the flanges of one of the lockup plates engagable with the flanges of an adjacent said lockup plate to lockup and prevent the rotation of the input shaft.