@sloinker, coincidentally enough, a friend asked me this morning about doing a pan drop and filter replacement on his 2016 Dodge Grand Caravan. It's only got about 50K km on it (slightly > 30K miles). He does tow a large tent trailer a few times each summer, so the tranny does get a workout.
I drive a 2007 DGC (3.3 with the 4-speed automatic), and replaced the factory transmission pan with an aftermarket one with a drain plug. At that time with the pan off I replaced the transmission filter. Since then I've drained about 2 quarts of ATF every 2nd or so OC, and have been using Castrol ATF+4. I check the level later on level ground, and top up if required. No problems so far, but I don't know the van's history prior to March 2001. It was at 199K km (c. 124K miles) at that time and is now at 245K km (c. 152K miles). No issues with the transmission, and I'd like to keep it that way. I may do another pan drop in the next year or so to change the filter again.
Anyway, back to my friend's 2016 ... the 'net tells me the 5th-gen DGCs with 3.6 Pentastar and the 6-speed automatic have no dipstick, and that doing a pan drop or even a drain-and-fill is quite complex, with the level being very temperature dependent.
What is your procedure?
Would it work to have him leave the van here overnight, already parked on ramps, and then drop the pan the next day, change the filter, measure whatever came out, and add the appropriate amount of new fluid? I would probably add a bit (250 ml?) to compensate for the volume of ATF left in the old filter. This method would mean the old fluid and new fluid are at the same temperature.
Thanks!