Backspacing 15\" wheel on Dana 60 Ok I got my Dana 60!!!!!!!! Im going to swap my SF 14 for a FF soon. I was wondering what backspacing will I need in order to run a 15x12" 8 lugger? I don't want to grind the front into oblivion but also do not want the tires to stick out too much. I run 38/15.5 Swampers. I can't wait to put another one ton Chevy on the road! Beefing up my truck broken part by broken part. 1986 GMC Jimmy 9" lift, 38" swampers, and a sarcastic liscense plate holder.