You will need a new computer, tranny wiring harness tranny lines (if running a cooler) which is recommended, shifter assembly, new fly wheel. Just a few things off the top of my head lol I will say its a lot easier to go from manual to auto than auto to manual. Also it depends on how the tranny is wired you may need a whole new harness,I'm not sure if the jeeps have a wiring harness just for the tranny that plugs into the main harness or not.