An invertible multi-application gearbox having a gearbox housing; a gear drive train within the gearbox housing with an input shaft for transmitting rotational force from an engine to the gear drive train and an output shaft for transmitting rotational force to drive wheels. The gearbox includes a plurality of gear s that are approximately symmetrically distributed about a vertical plane containing the centerline of the input shaft. The output shaft is separated a vertical distance from a horizontal plane containing the centerline of the input shaft. The gearbox housing includes a plurality of mounting location fixtures that are symmetrically disposed around the axial centerline of the input shaft and above and below a lateral plane containing that axial centerline to permit mounting the gearbox to an engine in either an upright or inverted position. A fast-change gear assembly is located on the gearbox housing for easy user access to change the torque transfer characteristics of the gearbox.
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