You should consider how much you have to spend. Some lifts are cheaper because of the shocks they use and the rear lift technique. The different rear lifting is with blocks or replacement springs. Springs are more expensive. Also if you lift it that high then you are going to need new steering knuckles so that your steering and control arms still fit their function. If your truck has the twin I-beam suspension up front then you will need drop brackets for the front and probably a drop Pittman arm for the steering. Another thing to think about is the driveline angles, if they have too much angle in them then they will either bind up or break.
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