leaf spring question

You can re-arch them yourself with a Large hammer. Take them apart and set them across two pieces of steel. Like a I-beam. move the springs back and forth while striking the spring between the two resting points. Keep comparing them to the other side until you have a better arch. When satisfied match the undone spring to the side you did. I got 3 inches of lift without much effort. It is not as hard as it sounds and is the way it was done by professionals.