I have the rough country 4.5 x-flex kit installed on my 1997 XJ Sport and I am tired of the flex joints going bad. I went for a drive today and the upper control arm flex joints are bad again. I am no 4x4 genius but I heard there is a johnny joint that just threads into the RC Arms that fixes this problem. Does anyone here have experience with this and if so do you have a part number for me so I can cure this problem once and for all. Is there a solid bushing kit I can replace the flex joints with? I am sure someone out there has experience with this problem .... HELP!!