I want to change the rear axle in my '39 Dodge. I will either go with a mopar 8 3/4, ford 9 inch, or ford 8 inch. Without going to the junkyards and actually looking, I have no way of finding out what will fit. If anybody can give me some measurements from their rod with these types of rear axles, it would help alot! My stock '39 rear measures 54" from backing plate to backing plate, 60 1/2" from wheel mounting surface to wheel mounting surface, and 46 1/2" center of spring pearch to center of spring pearch. Thanks to all who help!