if you reuse you current leafs, you can measure to get the lift you'll gain over the current height. But if you're adding in new leafs, that number will likely be different. Chances are slim that any 2 soa lifts will come out the same. that's due to the inherent variables in the parts themselves, but also that no 2 lifts seem to be done exactly the same way. for example, I've got 2wd packs with an extra main as an AAL, sitting on who-knows perches on a ford 9" (with a gazillion pounds of added weight in and on the truck). but that number won't help you much. :dunno: Sometimes ya gotta just do it and see what happens. then adjust as necessary. :thumbsup: