simply put. bumper and headlight height and the DOT.
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If you get a bedrack and throw some tires back there you'll level out.
You could try these shackles too. They will lower the rear some. Synergy Suspension 09-12 Ford F150 / Raptor Leveling Shackle
They got from 185 bucks a set down to like 45 a set.....thoughts?
Make sure it's quality material. I've always heard to go with billet and avoid cast blocks.