Congrats on the new to you Bronco II @Lira
Looks like a pretty nice truck... and how the market has affected pricing of these trucks... $3500 for a driver is a pretty good deal.
It doesn't look like it's had a "solid axle swap"... but I could be wrong. It really could have one of three front ends. D28... D28 hybrid or if you're lucky a D35. All of those are what we call TTB (Twin Traction Beam) axles. A couple pictures of it would help to identify what you have.
Between your VIN number and the driver door sticker... and a bit of research on the net... you can decipher what your new truck was built with. But as these trucks aged... people did a bunch of swapping of parts so what it was built with may not still be what it has.to suit your needs
Be sure to check out the Tech Library here on the site... it has a bunch of information to help you decipher what you have and also some how to articles to help mod it to suit your needs.
Welcome to BroncoCorral...