We have available OEM rubber bushings, poly bushings, RE superflex joints, RK Krawler joints, Currie Johnny Joints, Skyjacker Heim joints, etc. How about a discussion of how each of these designs are working out? Not a mine is better than yours slugfest, but more information than the vendors make available. I have read that some joints are maintenance free, while others require constant maintenance and/or replacement. All claim great flexibility. Your observations and experiences please.