Do I need a complete installation kit to do a gear swap? I've seen mini-kits, full kits, partial kits, etc. What else do I need? Planning on installing Motive Gear 4.56 front and back and a detroit locker in back. This is on a 2500LD 4x4so its 9.25 in front, 10.5 in back. Will probably need new axle seals on this one shouldn't I? Any help appreciated.