I did manage to get it done, but between researching, running to the dealer to get the dealer only part, etc., it took most of my weekend. Everything was just extremely tight by the firewall making it very challenging to get the throttle body connections and intake manifold mounts off and on. Thankfully I found some good info like this video:
It is for the Avenger, but the same motor. But it did show everything that needed to be done such as pulling both upper and lower intakes, etc. Huge PITA.
We have 2 other Jeeps, a 2000 WJ (280k) and 1995 XJ (160k) with 4.0s. Give me the terrible gas mileage and easy of maintenance/repair (not that it needs any) of the 4.0 over the 3.6 any day.
I searched around and everything I read said you need to change the entire $200+ oil cooler assembly. If you know different please let me know as I'm now terrified to change the oil filter in this thing knowing it may cost me $200+ and a day's work.
I've told my wife I want to get rid of the vehicle. We bought it used in 2014 and so far I am not impressed. Too much easily broken plastic parts. I still need to figure out what rattles in the door, why the lighting on the left steering wheel buttons flicker and repair a cup holder tab. Ugh. After this weekend I don't even want to look at it.
It is a 2011, BTW. I know, I should never have bought a first year vehicle...