This is a replacement XRAY Large Center Diff Outdrive Set intended for use with the optional Large Center Differential (XRA355013). These Diff outdrive adapters are made of HUDY Spring Steel and CNC-machined on precision German long-turn machines. Additionally ground and strategically lightened to reduce rotating weight, then further hardened to ensure maximum strength and extra-long lifespan. Final precision hand-grinding ensures a very high tolerance to ensure an ultra-smooth tight fit in the diff body and diff gear.