Tire size

Yeah, there's about a 5/16 increase in rear end width if you change to 4.5" bolt circle axles and brakes, too- I'll stick with the 235s being safe, 245s being tight, 255s dicey at best in a Dart, probably needing lip work and a hair more backspace. But then I'm kinda conservative about things like that. Ultimately it depends on the ACTUAL width of the OPs rear end, seeing as how he's already locked into the 4.5" backspace wheel.