the biggest part of lifting an Explorer is to accommodate taller tires,,
and with taller tires, there needs to be other changes as well,
stock gearing is set for a stock tire size, so it will not work well with taller tires as well.
once you decide what size tires you want to have and find out what gearing is in the diffs than that will tell you what you need,
if it has a 3:73 gear, and a 235 tire, if you go to a 33 inch tire you need to regear up to at least a 4:56 gear ratio, and that will make the mileage the same as stock,