Jeep JK Ultimate Dana 44 Front Axle Assembly 4.10 Ratio Fits 2007 to 2016 JK Wrangler, Rubicon and Unlimited;2 and 4-door models;4.10 Genuine Spicer Gears;5/16 thick axle tubes for improved strength, rigidity and durability;Redesigned and thicker brackets;Spicer chromoly axle shafts;Spicer Life Series (SPL) 1350 u-joints with triple lip seals and full-circle clips;Performance differential cover and Spicer performance gasket;Selectable electronic locking differential (harness sold separately);Improved caster angle and pinion angle optimized for lifted Jeeps;Increased gross axle weight rating;Dana recommends using military tested and approved 75W-140 synthetic lube (not included) Dana Spicer Dana Spicer Jeep JK Ultimate Dana 44 Front Axle Assembly 4.10 Ratio - 10010455 10010455 Complete Axle Assemblies