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I don't know anything about back spacing, but I wheel as well. When I go to bigger tires and wheels, I allways just ask the tire shop. Also if ordering on line. just go to tire rack .com, punch in your vehicle, they'll give you the information for your truck, even on bigger than stock applications. Body lift, kinda gaps the body, and frame doesn't it ? I'm no fan of body lifts, but to each his own. What tire, and wheel package are you going to run if you don't mind me asking. On my 04 4x4, I cranked the torsion bars about 2", I kept the stock ford 16" wheels, cause I really like them, I'm runnins 265/75-16's BFG AT KO'S, it equals out to be 32" tall, and about 11" wide. The BFG's are awesome offroad tire with good street manners. I may go to 33/12.50's in the future, if so, superlift has a nice 4" lift kit that I like. I didn't mean to talk your ear off, it was nice meting you, and good luck with your search. someone on here will probobly know the back spacing, stay tuned.