If you buy f150 5100s, stock or second height mark for FRONTS gets you around 2-2.5”. Expedition 5100s I would just go all the way
If you are gonna do rears, you need to buy either the expedition 5100s or f150 4600s and put a strut spacer on it
If you are gonna do rears, you need to buy either the expedition 5100s or f150 4600s and put a strut spacer on it