I just added a column for stress in a excel spreadsheat I made last summer. http://home.earthlink.net/~triaged/LeafSprings.xls You can use this to find out how much lift you will get from a set of springs (a bit more work than just putting the #'s in), Find the spring rate of those cool 57" f-150 springs (no one has got me the measurements yet /forums/images/graemlins/rolleyes.gif), you could even figure out where to put the bump stop to keep the springs from yielding when compressed. Have fun with it. If you have any sugestions I would like to hear them I would love to have some more info to put in the file... If you have the time (and a set of calipers/micrometer) I would love some more springs in the list.