I hope you all can excuse the barrage of questions I will be unloading here in the next 2 weeks or so, but I am coming from a Vw community and have never really been into domestics or off roaders (especially when you combine the 2). So this is new uncharted territory for me. I recently learned that the rearend in my 73 'Burban is a large GM Corporate 14 bolt. But how can I tell if its a 14bff or 14bsf? Also, what do those terms mean? I am assuming 14 bolt full floater and 14 bolt semi floater? Thanks.