This is a picture of a new Jeep Grand Cherokee Ecodiesel radiator. It's a simple radiator with none of the shutters and other coolant things you have in an Ecodiesel 1500.
Now look at the engine.
That's the oil filter back there behind that "whatever". it's not mounted on the same kind of cast housing with drip pan that's on the 1500.
The entire layout of the engine is really different in the Jeep. You don't even have a battery up top and I saw no foam pads under that different cover.
This engine is supposed to the same thing as the Ram 1500 Ecodiesel but the layout and parts show changes.
I did check and the number on the transmission is the same as a Hemi but also a new Ecodiesel 1500 I saw at the dealer today had the same part number for the transmission. Guess it's the same tranny without the cooler. Not sure there.
All of this could be factors in how it runs under tow compared to a 1500 Ecodiesel.