I drove a fairly simple 3.5 inch lift for a couple of years but was never satisfied with how my truck drove. If you put all the components on your vehicle that are in Slee's 4-inch kit, you will notice a performance issue on-road and off-road. I have had mine on my truck for 10 years now and I am really glad I purchased it. You can get these parts from other people if you prefer. The change in performance is significant and worth the money.