Backspacing question

mycuda said
4.5 back space, 8" rim should get close.
Not sure of your year, however.
Have 275 50 15 on 67 cuda.

famous bob said
Why not use offset spring hangars, and roll the outer lip before u try to measure anything ? U can very carefully cut a rear spring pad in half, (DID MINE ONN A BIG BAND SAW) and weld half of it to each side of the existing pads on the axle. u won`t have to mess w/ getting it right or out of whack. u then redrill the u bolt holes for the offset, the rest is bolt together stuff. U could end up w/ about 1 3/4" more room. I did it and have 295 65 15 drag radials on a 68 barracuda , which have very small wheelwells to start with. I did lengthen the front edge of the wheel well before paint tho for the tire heighth .

What fits a Barracuda will NOT fit a Dart. Barracuda's have more room than a Dart does, by about an inch. It's all on the quarter side, as the frame rails and axle width is the same. But just like Demons/Dusters/Dart Sports the Barracuda has a wider outer wheel tub. So, not relevant to a Dart Swinger. Even less relevant because the Dart's have such a low wheel opening. You can't hang the tires out past the quarters on a Dart. Well, maybe if you installed a 6" lift kit or something. But not on anything even close to stock ride height. On a Barracuda you can fit 275's without moving the springs at all. The absolute widest tire you can fit on a Dart without moving the springs a 255, and most Dart's can't even manage that without rolling the quarter.

BigBlockMopar28 said
Quick question: what about a 15x8 wheel with 4.5" backspacing with a 9.5 tire? Anyone see any potential issues with that as far as width issues? As you can see im a newb when it comes to this stuff. Thanks!

You're moving in the right direction. Do you have BBP axles? Because that changes the backspace you're going to need. I know you said you have an A-body 8 3/4, but factory axles would be SBP.