High strength 4340 Chromoly Axle Kit designed for 1987-2006 Jeep XJ / YJ and TJ / LJ Dana 30 front axles. The 50% 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 4340 Chromoly Dual Heat Treated for strength and ductility Uses large Spicer 5-760X Series U-Joint Replaces stock with no modifications needed 15-Year Warranty! No Tire Size Limits!