Complete automatic transmission failure.
I love this truck, but not happy the transmission went so quickly.
Stop changing your transmission fluid. I have 132000 miles on my 99 ram, trans is fine. I have never changed the trans fluid. This is a factory sealed unit, if it was meant to be changed it would have a plug like you oil pan. Everyone I have talked to with trans problems change their trans fluid. Leave it alone and your trans problems will go away.