Why 3 inch? In the height range your talking, usualy there are two ways to go. The 2 inch front leveling coils. These raise teh front, as the rear on our broncos is taller than the front. Next step is generaly a 4 inch kit. I don't recall seeing a 3 inch kit. What are you looking to accomplish. Is it just to add larger tires? If so, what size are you going to use?