One more idea. Try downloading a Plymouth service manual. Here is a link to a '37 that might have some help IDing your front axle, It is 220 pages and my laptop doesn't have much storage room left. Take a look and good luck.
Now, when you get all this stuff sorted out, get a small notebook, write it all down and toss it into the top of your toolbox....every single little bit of it. Years down the road, it will come in handy....
Since this is looking like alot of machine work, you ought to get a newer axle so you can run gm spindles and brakes....
RPM / Spirit / Speedway can fix you up.
Thank you for visiting the T-Bucket Forums! This site was created in 2006, to provide enthusiasts with a place to discuss T-Buckets. Over the years, there have been many imitators, but this is the T-Bucket resource you have been looking to find. We encourage you to register a FREE account and join in on the discussions.