There is no fixed formula. Its not an exact science. Our people identify the weaknesses in the OE suspension and develop Pedders components to correct them. We think like OE engineers, but without interference from sales, marketing and finance.
This kit allows you to get your ride height exactly where you want it and is so much better than just using lowering springs. For my last Magnum I used the ProKit from E1bach. It was ok but there's no adjustability and by the time you replace all 4 shocks the cost is almost the same as this Pedders kit.