You mentioned JKS shackles give you 1" lift in the rear I would double check that sense most company's say the same thing on XJ and MJ products even though they may not be 100% accurate. Comanche shackles are longer so I would just make sure to look it over one more time before buying. As for track bar and control arms I would install everything first then see how it rides and how much you like it then decide, that way you aren't spending unnecessary money.