I'm going to chime in here and watch the haters come out (lots of them on here now). I realize this is an old thread, however I've been off this site for almost 2 decades.
The multi-element, cam style, dog bone 904 sprags do not work. Do not install one--it'll cost you several thousand dollars in damage when it fails. Ask me how I know.
The stock 904 sprag does not like a lot of torque, big tires or tire shake. So, you need to take these things into consideration when planning a 904 build.
