High strength SAE 4340 Chromoly Axle Kit designed for 2007-2018 Jeep JK Rubicon. The strength increase is derived from the upgrade to 4340 chromoly, much stronger than the factory material. Furthermore, the shafts are dual heat treated, resulting in the best balance of strength and ductility. Fully assembled with heat treated full circle clips - ready to install Full Vehicle Kit - LH and RH assemblies High Strength SAE 4340 Chromoly Dual Heat Treated for strength and ductility Uses large 1350 Series Spicer 5-7166X U-Joint Replace stock with no modifications needed 15-Year Warranty! No Tire Size Limits!