Manufactured in the U.S. using only high-strength chromoly materials, RCV Performance Ultimate 30/30 spline CV Axle set simply replaces your 80 Series Land Cruiser's weak axle shafts with a high-strength design. The factory axles were designed with 30 splines at the differential, and neck down to a coarse 24 Spline at the CV creating a common failure point. This axle set upgrades the weak 24 splines at the CV to a 4340 30 spline race eliminating the need to neck down the shaft. Tests prove Ultimate CV Axles to be twice as strong as OEM shafts, and they're just as tough at a straight angle as they are at extreme angles. Even if you have big tires and big power there are no worries. Ultimate CV Axles are low maintenance and operate with a smoothness you can feel - whether off road or on the street. And we back it all with a "No Questions Asked" limited lifetime warranty.