A couple things. Along with raising or lowering ride height, adjusting threaded shocks also changes spring rate, making the spring softer or stiffer ( ie. lower ride height and stiffer spring) shock oil choice will change how much damping you get, that is.. how much of a hit the shock can take w/o going boingy. Using light oil reducing the damping factor which doesn't slow down the spring action as well, and the opposite for heavier oils. Heavier oils allow for bigger hit like landing big jumps. Finding the right spring rate, shock setup, and shock oil will depend on what kind of driving you do. For example... if you keep your truck on the ground mostly and want it to handle well in dirt or pavement you might want to set up your shocks with a low ride height and install stiff springs. The low ride height will mean less roll as well as the stiffer springs. You might also want to use a lighter weight oil... this would allow the springs to be more reactive and "feel" the road more. Now this is just an example, if you bash and jump n stuff you definately don't want a setup like this or you'll break something. Well, I hope this helps you understand shocks a little more. If I fudged anything up someone be kind enough to let me know. later.