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Message: <blockquote data-quote="MadStang" data-source="post: 924032" data-attributes="member: 10532">12" is actually what you should be running. you never want to be at either end of the coil sleeve with the spring perch. Somewhere between is obviously preferred. If you're all the way at the top, you're going to have spring preload before you even let the car settle under it's own weight, the reverse is correct for having the spring perch at the bottom, if your car at any point unloads the weight off of the spring, the spring will unsettle itself and could cause the coil to bind if it leaves the spring perch.As for the spring rate, do not go too low and you'll be fine. I don't know how much street duty your car has but I think if you go much lower than stock you may have issues with the car driving like a 70's caddy... bouncing all over.</blockquote>