Questions regarding doing drop on my truck

[68Mike]

So I'm ready to do the drop but not sure how low and what exact parts to get. I'm leaning towards a 4/6 drop and I'm thinking I would need to change the obvious: springs, shocks, rear shocks relocaters, and install an adjustable rear trak.

Am I missing anything?
Where's the best place to buy all that i need?

Thanks for your help.
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