Rear end location wrong? IM STUMPED!!!

[72bluNblu]

There are crager (sp) 14" rims w/ 225/60r14 front and 245/60r14 back tires on now. I'm hoping I can go to a 15 or 16 diameter rim with a 225/50r15 or 16 on the front and 255/50r15 or16 on the back with a 7in wide rim. My thought is less bulge in the tire may help with clearance and I'm not a big fan of the taller tires like my pops was.
I need to figure out the backspacing on the rims and plus or minus them correct?

Based on your measurements, your current tires would fit just fine with no rolling if you had an extra 1/2" of backspace.

255's have been done on some 70+ Darts, but, they're super tight. Now, if you roll the quarter lips AND buy a new set of wheels with more backspace, then it might be possible. But, with the tolerance stack you have going on, I think your better bet would be to increase the backspace if you want to buy new wheels, but keep with the 245's. You're not gonna find a set of 255/50/15's or 16's either. That's just not a size anybody makes in a tire you want to run.

 

[4mulas]

I am running Mopar Performance oval track leaf springs. These are about 1/2" shorter than stock and require a slightly longer front leaf spring mount.
View attachment 1716348012

A Body with Mopar Performance Oval Track Leaf Springs​

Item #: MREAR118KIT

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Price: $145.99 Leaf Spring Front Hanger Kit

They also allow for ride height adjustment which can be useful. You can also put shims behind the mount to space it rearwards for even more clearance. Worked for

All that said I would liver to see a side shot of your car and would also like to know what hole location you used. The one closest to the ground or the one above that to lower it 1.5”?

I am contemplating buying the same springs and hangers that you have and this sure would help out. Also how do you like the ride? The spring rate is supposed to be 120lb’s whereas all the ss springs are 150-160lbs.