I have a 93' Ford F-250 7.5 L 460. I was thinking about what to do with the springs on the front (2) which are sagging. I thought about getting new ones and adding an extra on each side to give me three. Any comments/opinions? I will be using this truck to plow so that is a factor. Also the shocks are the originals, I would like to replace them but wondered whether i should go back to OEM or something else maybe better suited for plowing?.... Any info/ideas and or pricing on such things would be appreciated. Thanks in advance.