Keep the water out and the grease in with RCV Performance's newest innovations, Spherical Sealing Technology. The Ultimate Pro-4 uses high durometer urethane to protect your cv joints from debris! Available upto a 35 spline inner race. The strongest CV joints available for GM 2500/3500 IFS. Proven in off-road racing applications, this joint is perfect for your plow truck or rock crawler. The CORR Pro4 racers with 5000#, 800+hp trucks, have gone from replacing joints after each event to running an entire season on one set. Avoid the cost and hassle of a solid axle conversion. Bulletproof your drivetrain with these instead. *Price is for one side only