Here's a tip for some who are putting off replacing this unit.
I had mine go bad on me yesterday (angry monkeys sound). I'm in a fairly metro area (Tampa Bay region), and nobody, and I mean NOBODY, carries this part in stock. The closest I could find was an Advance that carries the Dorman version, and even then, they couldn't guarantee delivery next day. Anybody who was able to order one wanted at least $130 for a version that wasn't even the Crown (NAPA wanted > $150 for their OEM version). Even my local dealership said that they stopped carrying the MOPAR version back in 2015.
Eventually, I was able to find the Crown OPDA on Quadratec for about $100 (Extreme Terrain had the same part for about the same price, but they don't give an option for next day shipping). So even with the expedited shipping, it still cost me less than local sources, and got here much sooner, only a couple of hours ago.
Also, I don't recall if it's been mentioned in this thread, but it still bears repeating. All of the replacement OPDAs, even the Crown, have been known to have issues with the cam position sensor. If you're not throwing any CPS codes, you're better off using the one that's already in the Jeep. Hang on to the new one as a spare, but all of the ones that come with the OPDAs seem to have an reputation for not lasting very long (3-6 months in some cases).
So as far as the OPDA goes, you're better off saving money, ordering the right part online ahead of time, and put it in before the monkeys come, especially if you're near or above that dreaded 100,000 mile mark, which most TJs are.