Fordman08f150

Hey all,prob about to trade in my 08 xl 2wd for an 08 fx4 and I got a couple questions cause its been awhile since I've been in the game lol,if I level out the fx4 I can run 35's correct? And the one I'm looking at has the 5.4 and I know there's been a few problems with them but don't know what they are if anyone has input on that and anything else related to the 08 fx4 I'd appreciate it,thanks!