The biggest difference is the ends… the RC has oem style bushings and the RJ has Johnny joints on both ends…If you wheel it, the Johnny joints have better articulation, plus they’re serviceable and rebuildable, which I prefer, but some don’t…..I currently have a RC adjustable track bar on my jeep. Is there any benefit to going to Rock Jocks track bar. I already have currectlync tie rod and drag link. Thank you