Transmission for coupling to hydromechanical power source includes differential and range modules including planetary gear arrangements, a plurality of selectively engagable clutch assemblies, and a drop box module, which includes a final output member. First and second power source paths provide power to the differential module. The clutch assemblies are selectively engagable to provide variable rotational power from the differential module to the range module, and from the range module to the drop box module in a plurality of directional ranges. The drop box adapts the variable rotational power provided in the selected range for connection in a given application.