The front struts in this kit reuse the stock front springs, upper mount, lower spring perch, and isolators. The struts work off of preload for the ride height settings, and the only real issue with preload-based ride height, is that your ride quality tends to get stiffer the higher you go. That being said, even the max ride height of the 5100s isn't overly stiff on the 2015-2020 F150s in our experience.