Diff outdrives for XRAY Active Diff of self-developed, world-renowned HUDY Spring Steel the most challenging steel material available are CNC-machined on precision German long-turn machines. The diff outdrives are also ground and strategically lightened to reduce rotating fat. The diff outdrives are then further hardened to ensure maximum strength and longest lifespan. The diff outdrive shafts are additionally precision hand-ground to a really high tolerance to make certain an ultra-smooth tight easily fit into the diff human anatomy and diff gear. Group of 2.