RCV Performance Ultimate TTB CV axles are designed to easily replace the u-joint axle shafts of the Ford Twin Traction Beam axle with a high-strength constant velocity design. Tests prove Ultimate CV Axles to be twice as strong as the OEM shafts, and they're just as tough at a straight angle as they are at extreme angles - where U-joints are weakest. Ultimate CV Axles also eliminate U-joint binding to allow smooth transfer power to the ground. Even if you have big tires and big power there are no worries. These axle shafts are made from aircraft quality high alloy steel as well, and utilize our race proven slip spline design. The RCV CV joint design also provides a greater range of motion than the TTB u-joint design, which is ideal for trucks with lifted suspension. The result is high strength and smooth power delivery without steering wheel shimmy.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. Axle set includes complete right and left CV axle shafts, SST seals and installation tool, installation instructions, synthetic moly grease, and installation hardware.Black oxide coating is standard.