Information High quality chassis partseries products. Made with high strength steel tubing for superior strength and durability. Stable performance, reliable quality and long service life Uniform thickness, no blow holes, slag, cracks, tearing, or incomplete fusion. Measured by specialized inspection tools after welding to make sure assemble hole , bushings insert, and installation sizes are proper. Professional InstallerisHighly Recommended(No Instruction Included) Alignment Highly Recommended After InstallCompatibility Chart For 2012-2017 Jeep Wrangler V63.6L w/1/2in.RingGearBolts;Dana44 For 2007-2011 Jeep Wrangler V63.8L w/1/2in.RingGearBolts;Dana44 For 2018 Jeep WranglerJK V63.6L w/1/2in.RingGearBolts;Dana44 For 2014 Jeep Wrangler Altitude Sport Utility 4-Door For 2014 Jeep Wrangler Freedom Edition Sport Utility 2-Door For 2014 Jeep Wrangler Freedom Edition Sport Utility 4-Door For 2015 Jeep Wrangler Willys Wheeler Sport Utility 2-Door For 2015 Jeep Wrangler Willys Wheeler Sport Utility 4-Door For 2015 Jeep Wrangler X Edition Sport Utility 2-Door For 2015 Jeep Wrangler X Edition Sport Utility 4-Door For 2014 Jeep Wrangler Altitude Sport Utility 2-Door For 2014 Jeep Wrangler Polar Edition Sport Utility 2-Door For 2014 Jeep Wrangler Polar Edition Sport Utility 4-DoorPackage Content 1x Rear Differential Case Kit