This system deletes both upper and lower balljoints and gets rid of a telescoping upper balljoint. Both the upper and lower cups press in just like regular balljoints with one HUGE difference……it’s the last time you’ll ever have to press in any joint! The rebuild process consists of removing the C-clip and replacing the spherical bearings. Both assemblies featured a shim/O-ring which seal the bearing from debris from the top side. All spherical bearings feature PTFE liners, so no greasing is needed but dry lube can be used.