Do I need new hoses or can I reuse my old ones?

Inspect your existing hoses for cracks, bulges, or soft spots before reinstalling. If they're original equipment or haven't been replaced in several years, swap them out—hose failure after a new radiator install is a costly mistake. New hoses are cheap insurance.

What about the oil cooler lines—do those connect the same way as OEM?

Yes, the oil cooler uses factory transmission line fittings. Your existing transmission cooler lines will bolt directly to this radiator's oil cooler ports without adaptation.

Do I need to flush the cooling system before installing this?

Flush your entire cooling system before dropping in a new radiator. Old coolant contains sediment and corrosion buildup that clogs a fresh core fast and voids the reliability you just paid for.