Looking to change the springs on my '78 cj7. I believe I have about 2.5" of extra spring arch. I would like to know what/how to measure my springs in order to figure out what I need to replace them with new springs to get the same amount of lift. I have 2.5' wide springs front and rear, with 5 leafs each. Lookig for some springs thhat are a little softer/flexable.