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The "key" i believe is a ford torsion key that allows for adjustment. If you want just a little bit more out of the truck just do the leveling kit and you're going to need shocks. I did a 3" kit to my Ram front and rear and needed shocks, but mine were shot to begin with so it did not matter. You can always option to do the torsion keys also, its really not a problem with it. I am going to do my fathers 05 Z71 once his needs shocks, and stuff a little more tire under it.
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