This is the best of the best Halo 30 locker setup. Included is a billet case, 6 gear chromoly carrier, Halo locker kit, new seals and bearings, larger and stronger custom spider gears. The new 33 spline set up utilizes a 33 spline axle. It is over 1 inch in diameter, officially the largest UTV axle in the entire industry! This is the ultimate upgrade for your ride for X3 & defender of any model This will also serve as the upgrade to the Smart Lock setup. if you currently have a Smart Lock model machine, and wish to have a heavy duty alternative.this is the upgrade to replace smartlok with.. Must replace axles with Halo 33 spline axles we offer both RCV and Turner axles. If you already have RCV we can sell you just a set of cups for this setup. Otherwise you will need to buy complete set of axles for this differential. We have one of the best warranties on the market. There is a limited lifetime warranty on the case. and 1 year warranty on anything Halo locker.. we do retain the factory style ring and pinion, and will replace anything Halo related in the diff. Anything Halo makes is covered 1oo percent..