Hi Austin and welcome to the forum!
There are two families of axles and two sub-sizes: Ford and Chev each made their own axles (Fords are split around the pumpkin and Chevs are made like a banjo with front and back covers bolted on).
The axles were made in two sizes: light and heavy. Light axles were used on trucks up to 15 hundredweight (CWT)- about 1 ton. Heavy axles were used on all bigger trucks.
Some pictures will help us suggest where you can find the parts you need.
Mike
