When we turned the JK to the stops either way, we noticed the U-joint knuckle bind felt in the steering wheel as it moved back and forth a little. No harm was being done, but it was annoying. RCV Performance’s Ultimate JK Rubicon 44 front axle set utilizes CV joints instead of U-joints. CVs are smooth at full lock with no knuckle bind. The RCV kit comes complete, ready to install. RCV includes a tool to help with the installation of the orange urethane boot that protects the CV from debris and water.