A steering knuckle for adapting a unit bearing front axle of a vehicle using original equipment manufacturer (OEM) spindle and wheel hub assembly parts to replace the unit-bearing wheel assembly, wherein the steering knuckle comprises a first side of the steering knuckle that is configured to receive one or more components of the OEM spindle and wheel hub assembly. The steering knuckle includes a boring for receiving a spindle hub on an OEM spindle, and one or more apertures circumferentially spaced around the boring and for alignment with holes on a spindle flange of the OEM spindle. Studs are inserted through the apertures of the steering knuckle for securing the OEM spindle to the steering knuckle. A second side of the steering knuckle is configured to be affixed in pivoting relationship to an axle housing of the vehicle wherein the axle housing is originally manufactured to be linked to a unit-bearing steering knuckle.