It won't need too much, you won't really know how much until you get them on. Every truck is a little different. It also depends on personal preference, some people want/need more clearance than others.
USArmy Active Duty. Nathan, 2002 Sport Trac 4x4. -TT, K&N intake, Poweraid throttle body spacer, Flowmaster 40 with turn down, 30k Kensun HID headlights and fog lights, high beam relay mod, Grille delete, Recon light bar w/ reverse lights, tinted 3rd brake light, 5% tinted windows.