Need help on lift kit + parts

I have a \\'96 bronco that has a 3 inch body lift sitting on 33\\'s. I want to make a bit taller, i went onto Bronco Graveyard and found a 4 inch suspension lift (Obviously that is going to be 7 inches of lift) but i told a guy on instagram about it and he recommended the 4 inch lift as well, he also said with this that i wouldn\\'t have to change the driveshaft length. I know a thing or two about lifts and that the driveshaft length is going to have to change. If not, what will?? If i got the extra lift i also planned on getting 38x12.5x16 TSL Super Swampers...