Figured I'd add my experience to this thread for future OPDA installs. I have a very late build date LJ (06/2006) with a rev. E factory OPDA. Never had any issues with it (currently at 170k), but after reading that the OPDA gear was hardened steel on the OEM unit, I decided to change mine out to limit cam gear wear. There was significant wear on both the OPDA gear as well as the cam, but not enough to warrant replacing the cam. Crown unit went in without any issues, but the housing itself is oriented 90 degrees off from where the factory one was (the cover bolts now are perpendicular to the block instead of parallel). I tried fiddling with it for awhile, but I'm assuming this is due to the oil pump driver (looks like a flat head screwdriver) being in a different orientation on the Crown unit. I made sure the sensor was in the same orientation to the internal wheel of the new OPDA and removed the plastic pin before install. I then replaced the plastic pin with a thin dowel (inserted from the top, OPDA cover off). You can also use a screwdriver of the proper diameter. Dowel just stays in until the unit is properly secured into the engine block, then remove dowel, replace cover. I didn't like the idea of letting the crown plastic pin break off and stay inside the OPDA as most videos suggest. Take note here: If you visually use the factory OPDA to find TDC, there are two holes in it. One has a sleeve (or collar) going vertically inside the OPDA housing, one doesn't. The one with the collar is the factory TDC orientation hole and is what lines up with the location of the Crown plastic retaining dowel in the new unit. This is the hole you want to line up with the OPDA timing wheel hole in the old OPDA before you install the Crown. If you use the wrong hole, you'll have a bad day (insert jokes here)- it will cause the timing to be off. Reuse the mopar sensor and save the new crown sensor as a spare. Do not, under any circumstance, turn the camshaft pully or crank the motor with the OPDA removed. If you can't get the new OPDA lined up, you can use a long flathead to turn the oil pump driver inside the block (look inside hole the OPDA was removed from) enough to get things to line up.