When I had my 99' Ford F150 I had a 6" suspension and 3" Body, w/ 38-14.50-16 toyo m/t's, it was sick!!! Honestly should have never sold it, the only problem I came a across was that my additional trans cooler hose eventually wore a hole in it because of rubbing. Biggest thing is IMO make sure no hoses rub (look at everything) I mistakenly missed that one, get gap guards and make sure to paint the frame, (Chevys show major frame) when body lifted.
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i Know this isnt a ford forum but here was mine. other thing is either make or install Bumper extensions, mine was pretty clean and 95% of the people didnt know it had a Body Lift. By the Way Im 6' 6" and have a 36-38" inseam. This was the biggest F150 in WA state that the time.