Revolution Gear and Axle Discovery Series D30, 4340 Chromoly 30 Spline Front Axle Upgrade Kit, without Locker. Kit comes with 2 inner axles, 2 outer stub axles, 2 Dana Spicer 5-760X U-joints and 8 Full Circle Snap rings to hold it all together. All Discovery Axles are backed by a 10-year warranty against failures, including but not limited to U-Joint failure.