Rear End Length for 4-Link & 315/60/15's

Do as 69Mope suggested.

Get the wheel/tire combo you want, set them under the car and measure... no mistakes that way!

If you cut the housing to 52ish" flange to flange to flange, the wheels will have a lot of backspace.

I have a spreadsheet that will calculate real close, the wheel backspace to center in your tub for whatever overall axle length chosen.

Example. Dart Sport, 15x12 with a rear axle width totaling 57.5 will require 8.5" backspace wheels.

Move the backspace to 7.5", rear would be 55.5"

Evey inch of backspace you take out of the wheels, makes the rear 2" shorter.