A gearing assembly comprising:
- a differential configured to engage a first axle shaft and a second axle shaft of a vehicle and configured to be driven by a drive shaft of the vehicle;
- a differential control pinion gear different than and separate from a pinion gear driven by the drive shaft of the vehicle, the differential control pinion gear configured to be driven by a variable speed reversible motor of the vehicle;
- a first plurality of adjustment gears configured to engage the differential and to engage the differential control pinion gear, the first plurality of adjustment gears comprising:
- a first planetary gear carrier;
- a first set of stepped planetary gears, each coupled to the first planetary gear carrier and each including a larger diameter portion affixed to or integral with a smaller diameter portion, the larger diameter portion being coaxial with the smaller diameter portion;
- and
- a second set of stepped planetary gears, each coupled to the first planetary gear carrier and each including a larger diameter portion affixed to or integral with a smaller diameter portion, the larger diameter portion being coaxial with the smaller diameter portion;
- and
- a second plurality of adjustment gears configured to engage the differential and to engage the differential control pinion gear, the second plurality of adjustment gears comprising:
- a second planetary gear carrier;
- a third set of stepped planetary gears, each coupled to the second planetary gear carrier and each including a larger diameter portion affixed to or integral with a smaller diameter portion, the larger diameter portion being coaxial with the smaller diameter portion;
- and
- a fourth set of stepped planetary gears, each coupled to the second planetary gear carrier and each including a larger diameter portion affixed to or integral with a smaller diameter portion, the larger diameter portion being coaxial with the smaller diameter portion;
- wherein the first plurality of adjustment gears and the second plurality of adjustment gears are configured to controllably alter a rotation rate of the first axle shaft relative to a rotation rate of the second axle shaft through rotation of the differential control pinion gear produced by the variable speed reversible motor.