A countershaft transmission includes an input member drivingly connected to a power source and at least one directional clutch assembly structured and arranged to be selectively engageable with the input member. At least one speed clutch assembly is structured and arranged to be selectively engageable with the at least one directional clutch assembly. A dual range assembly is structured and arranged to be selectively engageable with the at least one speed clutch assembly. An output member is selectively engageable with the dual range assembly wherein a rotational speed of the input member is transformed to one of a high range speed or a low range speed of the output member through the dual range assembly.