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I've done a lot of searching on this, and people will get anywhere from 2-4" of lift depending on their shackle setup and how old the springs are.
If you are aiming to get 4", you might just want to get a chevy pack with the overload spring in it, as well as some shackles a little bit longer than stock.
I have seen people using blocks with these as well, but, that is a whole 'nother debate.
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