3 3/4" = not enuff backset

4 3/4" = too much backset

4 1/2" = just right on backset

remember to include the tire sidewall bulge and leaf spring clearance when measuring backset for rims.

4.50 backset is perfect for most mopars with 7"/8"/10" wide rim.

on my 76 Daytona Charger SE I ran a 10" wide rim with a 4 1/2" backset with 275/60/15 or the N50/15 = 325/50/15