Hi all. My grandfather's old 1939 stock car was burned up in a garage fire a few years ago. I am trying to find some parts for it to get it back in perfect condition. I am specifically looking for a rear end gear with a 6.37 ratio for a ford passenger car. Either that one or a rear end gear with a 6.40 ratio for a 1940s Ford truck. If anyone knows where I can get those, I sure would appreciate it!

Thanks!