I'm going to guess it's lift, so the shackles are 1" over stock or 5" eye-to-eye. That's still not that much. The max would be 1.25"-1.5" or 6.5"-7" eye-to-eye. You should be able to seek them BUT you might not want to use the degree shims that come with your leafs as your rear pinion is already going to be pointed up a bit. You could use the degree shims on the front to point the pinion back down but you'll want to check and see how many degrees off horizontal the pinion is.