Do not be surprised if you purchase that the coolant temps run 212-230 degrees depending on conditions. The idiot gauge on the dash won't move but looking in the EVIC display will give you a numeric reading. The OEM thermostat is 216 degrees. They are designed to run hotter. There is plenty of information concerning this on the Ram forums. Conversely I find transmission temps run lower than my 3.5 Ecoboost F150 as the Eco transmission has a thermostat that operates basically at the same temp as the coolant temperature.
Also be aware that the recommended oil is Pennzoil Platinum Plus 0-40 Synthetic due to the cylinder deactivation that works off the oil. This oil is expensive and hard to find. As much as I prefer to do my own oil the dealer charges $80 for 7 quarts ( usually runs $10 a quart), filter and tire rotation. Also this makes it easier if I ever need to make a warranty engine claim.
Good luck.
Doug