I have been told from a few sources that a middle 60s Maverick rear end will bolt right up to my 1951 Henry J. It measures right up with the backing plates. I have not made the switch yet as I have had some health issues. It has to be a rear end from a v/8 so the bolt pattern matches, it is a Ford 8" rear end and you may have to change the gear ratio but that is easy on a Ford 8". If you are going with totally stock then this won't be of any help.
I have a 4/10 rear end in my J, no o/d so at 55 mph my J is wound out pretty tight so I'm changing it out to make it more road worthy and easier on the engine at 60 or 65 mph.
Don#1913