Revolution Gear & Axle Discovery series D44 4140 chrome-moly rear axle kit for 07-15 Jeep Wrangler JK, Rubicon 32 spine kit, fits factory locker only. All revolution rear axle kits come with the bearings seals and retainers 100% pressed together and ready to install and are backed by a comprehensive 10 year **that covers All failures. (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). All revolution gear sets are made from the highest quality steel and are precision heat treated to OEM specifications, making for the best aftermarket gears available. All revolution ring and pinion sets are backed by an industry leading 2 year **against defects. Revolution gears are also double, and in some cases triple lapped for flawless setup, smother running and longer life. With products that have been street, off road and race proven for more than a decade, you can count on Revolution Gear & Axle products to be the best aftermarket parts available.