I just measured the width on the 46 Ford rear axle I have and it is 62.5 inches from wheel mounting surface to wheel mounting surface. Most of the info I have seen suggests circa 1969 Camaro rear axles to replace these as they are slightly narrower at 60 inches. I guess that is to allow some fatter wheels under there than the original 16 inchers. But I may actually go with a 79 Camaro rear axle under my 46 because they are easier to find and I may be scoring one in a 79 Camaro I am trying to buy. I will simply run inset rear wheels to make the tires fit where I want them.

Here is a very helpful chart of various rear end widths:

http://www.carnut.com/specs/rear.html


Don