Do I need to drain and refill coolant when I swap this in?

Yes. Drain your system completely before removing the old radiator, then flush the block and hoses if you want a clean install. Refill with fresh coolant to OEM spec once the new radiator is mounted.

Will this radiator work if my original one is cracked or leaking?

This is a complete direct replacement—if your current radiator is failing, this OEM unit will restore full cooling capacity and eliminate leaks.

What tools do I need to install this myself?

Standard hand tools—socket set, wrenches, and a drain pan. Your truck's service manual will walk you through bolt locations and torque specs. Budget time for coolant draining and refilling.