For those wanting to get the most out of the 6-8" lift, 4-link long arms are the way to go! Longer arms equate into a smoother operating suspension as the axle will cycle reward under the truck less. That means your shocks move in a more linear fashion putting less stress and more focus of the impact forces into the suspension. With the forces applied being better handled, less impact gets translated through the rest of the truck giving you better ride quality and improved steering feel. This kit comes with everything you need to swap out you old, tired arms to these new long arms!