You must be runnin the 48'' rears then..... With the 3rd gen rears you have to move the front hanger forward a bit..... I'd just notch my BM's run straight shackles and call it good... I bought a set of boomerangs and only ran them for a week...... they are now just sitting in my tool box at work.... I switched back to 5.5'' straight shackles... And yes I would recommend running a flat pitman arm if you arent using a front drop hanger