Above is some good advice. For travel need to get rid of or disconnect the sway bar. Another thing to keep in mind is how long your shocks are. The stock mounting location can limit travel on the front of the truck (short shocks can only extend so far).
For instance on a typical 4" lift you would get 9.24" of shock travel. That is 4.62" up or down from being centered. If you want to remove your stock shock bracket and add some F*rd shock brackets then you can run longer shocks. ORD says a 12" shock can be run with a 4" lift. Now you get +,- 6" of travel.
http://offroaddesign.com/catalog/Bilstein 5125.htm
I had 2" Tuff Country HD front springs and no swaybar. But had 9" travel shocks. Front tire would drop out pretty far for what I had.
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With more downward travel you need to make sure your front driveshaft is long enough and your brake lines are long enough also.
I now have 13.2" front shocks and ORD custom front springs. Lots of travel and a very soft ride. You can see the other shock mount I have here:
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