I have an '03 Screw FX4 and was wanting to upgrade the rear suspension. I've got Rancho RSX's on the way but was wanting to improve on the leaf springs. I also want to maintain the stock FX4 4x4 ride height. Are there aftermarket companies that make better quality stock height leaf springs? Or can I remove the lift block and replace with an aftermarket leaf spring that will lift the truck back up to stock height? I'm looking for improved ride from the leaf springs as well as getting rid of a little sag... I don't want add-a-leaf or air bags.