Will this bolt directly into my truck without modifying the brackets or shroud?

Yes. This radiator mounts at factory points with no drilling or adapter hardware required. Your existing cooling fan shroud and brackets will align as they did with the original unit.

Do I need to flush my cooling system before installing this radiator?

Absolutely. Old coolant can contain rust and debris that will clog a new core immediately. Flush the system thoroughly, inspect the hoses for cracks or soft spots, and use fresh coolant rated for your engine.

Does this come with upper and lower hoses or just the core?

The radiator core ships as the main assembly only. Your original hoses can be reused if they're in good condition—replace them only if they show cracks, leaks, or soft areas when you pressure-test the system.