I think JKS says they get 3" of height with a stock Jeep. Others don't really say how they measure it. I think AEV/Nth used to say 3" on a built Jeep. So they always gave a little more lift on a light Jeep.
I don't think you can really do calculations like you can with a linear rate. One of the things I like about JKS though is that they do offer both 2" and 3" so you can mix a match a little to get what you need if you don't want spacers or if you have a heavy front and light rear or something else.
I don't think you can really do calculations like you can with a linear rate. One of the things I like about JKS though is that they do offer both 2" and 3" so you can mix a match a little to get what you need if you don't want spacers or if you have a heavy front and light rear or something else.