Welcome to Fordbarn. It would be great to see a couple pictures of your truck.
If you want a resource of information about your truck (a Model 51 if it's really a dump truck) consider buying a copy of the 1935-36 Model 51 Truck book from the Early Ford V8 Club. It's $60 plus shipping which is some change, but it has lots of info.
https://shop.efv8.org/collections/fo...-shipping-rate
I'm happy to try and answer any questions you might have.
Dave