Abstract: A system and method to add an additional drive axle to a vehicle may include an auxiliary shaft aperture bored through the differential housing and an auxiliary shaft sleeve mounted over the aperture. An auxiliary shaft has a splined end interconnected to a modified pinion and a short transfer drive shaft interconnect disposed on an opposite end thereof, the short transfer drive shaft interconnect extending out from the modified differential housing through the auxiliary shaft sleeve. A short transfer drive shaft is operatively interconnected to the auxiliary shaft and rotational therewith. Further, an additional drive axle assembly is mounted to the vehicle rearward of the original drive axle, and the modified differential is operatively interconnected to an additional drive axle via the short transfer drive shaft, such that when the short transfer drive shaft rotates with the auxiliary shaft, the additional drive axle rotates with the original drive axle.