4in vs 4.5in bolt circle rear axle

tooslow said
Is a 4in BC as strong as a 4.5in BC

Not IMO.
On a road car only though, 7/16" should be fine.

A56 said
Well if it means anything '69 M code 440 cuda's and Darts came with a 4'' bolt circle with an auto trans. and E70 14s.

Try it with a 4 spd and slicks. Keep the hook and body panel repair shop numbers handy.