Abstract: A feed mixer vehicle having a hopper with a base is carried on a chassis. A vertically extending auger assembly is rotatably mounted in the hopper adjacent the base, extending from the hopper base. A reduction gearbox assembly having a reduction gear train assembly is mounted adjacent the base of the auger assembly. The reduction gear train assembly has an input shaft and an output shaft, with the output shaft coupled to the auger assembly. The reduction gearbox assembly further includes a first planetary gear set assembly meshed with a second planetary gear set assembly, where the first planetary gear set assembly includes the input shaft and the second planetary gear set assembly includes the output shaft. Coupled to the input shaft of the reduction gearbox assembly is an axial flux motor assembly.