Revolution Gear and Axle Discovery Series D44 4140 Chromoly Rear Axle Kit for 07-18 Jeep Wrangler JK, Rubicon 32 Spine kit, fits Factory locker ONLY. All Revolution rear axle kits come with the Bearings seals and retainers 100 Percent pressed together and ready to install. All Discovery Series Axles are backed by a 10 Year Warranty covering manufacturing defects and axle breakage, bent axles and twisted splines. This warranty is non-transferable. U-Joints are only covered under warranty for 1 Year (Other than Revolution Gear HD Chromoly U-Joints). Parts subject to normal wear are not covered under warranty; this includes bearings and seals. (Note: wheel studs are included in kit but not installed into the axles for safer transport. Install studs using red Loctite and torque to 90Ft-Lbs)