The often imitated, never duplicated Superior Axle and Gear has been manufacturing high-quality axle shafts, gears, and more since 1934, establishing itself as a go-to source for time-tested and trusted automotive parts. Superior Axle and Gear uses only its own exclusive engineered designs with extremely tight specifications to manufacture or source its products. Its products are built from premium chromemoly materials, with rolled splines, torsional equalization, and higher amounts of splines on weaker applications.