Factory BBP on 7.25 axle

Look for BBP under 73 and later disk brake equipped cars. The 4-wheel drum brake cars used the 4-inch pattern. Avoid those with 2.45:1 or 2.21:1 ratios. I did see an outfit on the internet that had 3.55:1 gears and up for the 7¼-inch rear end. Sorry, don't remember site.

The BBP 7¼-inch axle shafts are longer and the backing plates on the BBP are different, too. Haven't compared the drums to see if it might be worthwhile to drill them out to fit.

Supply is dwindling. I knew a fellow down here that was cutting them up and making big bike trikes with them. Light, cheap, and plentiful.