Re: Lifting just the front
Belive it or not, if you raise your front end by using taller springs you will affect the camber and your tires will be angled like a v. Usualy I only reccomend replacing the front coil springs if they are sagging. If you do go taller you will have to adjust the camber, if not you will notice it the most when you turn at full lock. Also chances are that the front of your truck kinda looks like it's lower than the back, most Broncos do.
Hope this helps,