The FT coil-over conversion is a great system, however I personally would not recommend it if you desire less than 6" of lift. Doing so will not give you very much compression travel which will lead to frequent bottoming. This is due to the inherent physical dimensions of coil-overs which are not as space efficient as a standard coils. Therefor they will require more lift for an equal amount of suspension travel.
Here are a couple of examples:
TruckToyz Performance Image Viewer
TruckToyz Performance Image Viewer
