That is kind of defined by how the truck is used. Some people are able to just put spacers between the frame and crossmember and be OK if they don't articulate much. Sometimes you can get away with a few degree wedge to change the pinion angle but this is not advised and mat wear u-joints and gears faster. As you are putting all spring lift, sounds like you want it to be usable off road. In any case, (my opinion) the "BEST" idea is to have shafts lenghtened so you keep all angles right and not create faster wear on drivetrain parts.
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