RE: Ordered TJ lift today..questions remain
A 2" shackle lift means having a shackle 4" longer than stock, and 8" between shackle bolts is just WAY too much. It'll make for some funky handling and pinion angles, not to mention decreasing your approach and departure angles. Take it from experience, the shackles will hit everything offroad.
I suggest keeping shackle lifts at a minimum and look elsewhere for the needed lift. There are other alternatives just as inexpensive or cheaper.