I believe that Jason at velocity fab is close with a guy who biulds custom length 934 cv's. I live about an hour away from him and have seen that kit up close on one of his customer/friends trucks. pretty trick. I do not personally have the kit but i can tell you from the rest of jason's product that he makes very high quality stuff. As for rock crawling, I've never seen that kit flexed out, but im sure it would do just fine with whatever you threw at it. -Drew