Originally Posted by FoxRacR17
Would that be above the top collar that locks, or above the collar that adjusts preload, or from the top of the spring up?
Not sure. Trial and error, of course, so adjust to the top of something, measure, and make changes as needed.
3" is a guide and not a rule, and really it's only possible to get an exact lift if you measured your truck from the floor to the frame on both sides before and after, with the same tires set at the exact same tire pressure.
My adjustments are mostly eye-balled until I got 1 side where I liked it. From there I measured from the ground to the frame and adjusted the second side until that ground-to-frame measurement matched. Many, many nights spent in the garage.