As I own a Bronco, the frame looks Ford to me. Those spring buckets are definately Ford as well as those 3 bolts holding the steering box in. In the 2nd pic, you can see the engine crossmember. This used to be a 80-96 Ford 1/2 ton. The TTB (twin-traction beam) front axle was bolted to that beam. That little tube on the beam is the stock ps cooler.
The front axle is a ball-joint type and from the size of it, could be a D60. But look real close at that track bar mount on the axle. Very little bead I could see.
Also, not being anyway picky, but there appears to be an extra green tube bar. It's located in the 1st pic where the passenger foot well is. Nothing on driver's side to match.