The Dana Holding Corporation Ultimate Dana 60 axles for the Jeep Wrangler JK include bolt-in replacement upgrades for front and rear axles. Additional features include 35-spline, SAE-4340 nickel chromoly steel axle shafts designed for higher torque, larger tires and off-road punishment; a greatly enhanced carrier with Spicer performance ring and pinion gearing; massive SPL 70 u-joints, exclusive to Dana; full-float design for greater load-carrying capacity; and upgraded, heavy duty brakes with plug-and-play ABS.