my truck has a 3/4 beltech lowering kit on it and im thinking about grinding down the back brakes for 15inc drag rims and run the hoosier 15x10x30 and i know the only way with the 3/4 drop is to find the right back spacing for the tires to tuck and not hit the out side of the fender so could someone tell me what would be a safe back spacing so it would tuck and not hit

 

I don't run your same setup but most guys are running 16x10's so they dont have to mod the calipers, as for backspacing I think mine are 4 or 4.5 inches and they fit fine. Todd