Hmmm, I've read all of these advice posts most thoroughly. Adam did ask about a 2.5" lift for his YJ. Spring overs are great. cept your going up, as stated 5" or a bit more, which is twice as high as was asked about. Another stated that no problems have popped up using Rough Country "spacers". I should hope not, as there are only a small handful of companies that make rubber or poly spacers for the entire automotive industry. It'd be pretty difficult to break a poly spacer. Having stated that, Rough Country lift kits are just that "lift kits" and they do real well on street machines and mall crawlers. Adam, I've been building "Overland" rigs for 25 plus years and 2.5" is just about right. With a YJ you will need a slip yoke eliminator kit, even with a mild lift. Don't skimp on cost. You certainly don't need an AEV conversion, but a thousand dollars or a little less for a complete OME suspension kit, or a Dobinson suspension kit will last longer than your jeep and you will have no problems if installed correctly. BTW, a leaf spring suspension geometry is very simple compared to a coil spring linked suspension. They also give you complete choices about spring rates, ie, Heavy, Medium, or Light.. As an example. The OME shocks on my cruiser have nearly 100,000 miles on em and still good. I'm gonna change them before winter just because I want to follow a world renowned Overlanders advice and try out some Dobinson shocks. Hope I sorted a couple of things out for you.