I started reading this article and it occurred to me that when I purchased my 2003 Dakota, that I got the tow package with it. The tow package included a frame bolted tow hitch, rear axle crossbar and an additional transmission cooler. The additional cooler means that it requires additional transmission fluid

While I don't have to remind Dodge service service personnel about it when they service my transmission as they have access to my truck's information, I do if I take it anywhere else to have the transmission serviced, in order to ensure that they put the additional fluid in. You might want to take a look and see if there is a smaller secondary radiator on your truck. That might be part of the issue. Then follow the procedure that most of the people responding have recommended.

2003 Quad Cab Dakota Sport
4.7 L. V-8
w. Tow Package