looking into how i'm going to lift the rear of my truck to match the front SAS conversion. i currently have an ORD shackle flip, which is a definite. so obviously i'm staying leaf sprung. what are the pros and cons of both spring over and spring under suspensions, using a flipped shackle? FWIW, the truck will rarely if ever see trail use, primarily a street driver, with the occasional mud/sand play. i'm going to try to stay with ~6" of lift if at all possible. why am i building an SAS truck for a driver you ask? nobody around here has one. the very same reason i'm entertaining the idea of a spring under suspension... its different.