Shran is right, you really just make em tight enough so that they don't back off. If it makes you feel better, the duff bushings said 50 ft. lbs., and copied straight from broncoii.org-----Tighten until the upper body mount just starts to get squished (or to a torque spec provided). Don’t forget to us loctite on the nuts.-----It's really just a matter of not letting them slop around, and not letting them back off.