my truck shakes when going 70mph
I would suspect that you are feeling too much positive toe, although it sounds like you have probably affected all three angles, and caster can affect high speed handling as well. You might get by with simply having the toe checked and adjusted, which could eliminate the shimmy, but your camber is most likely off too, and although I don't think that it would cause this particular problem, it will affect tire wear, so I would opt for a complete alignment at this point.
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