All details concerning the rear axle we chose for the orange bomb. Please note that this or any modification we did to the orange bomb was done to what we considered the best choice for our vehicle. It might very well not be the best choice for you. Be sure to get well informed before you make any decisions. I am not a professional, just sharing the choices we made for your information only. Ford 9 inch housing & axle, Roadster Round Back Width (From wheel flange to wheel flange): 61 inch...