I'm no expert by anymeans, But I know of 4 friends/coworkers who have had signifcant trans issues in their Rams. 3 of the 4 had total rebuilds before the 100k mile mark 2 of those were 1500's other was a 2500. the 1500's were both 05's and the 2500 was an 06. The 4th one was a 1500 04 and at 42K miles the converter failed. I know these 4 people well, and in talking with others at work i was told of someone else who had a 3500 Ram that had a trans rebuild at just past 100k miles i think he said 104k replaced with another trans from the dealer and it failed at 155K miles. This was a later model Ram as well Not exact on year, but he's a contractor and puts alot of miles on it. He's on his 3rd and it seems fine now, they said he's around the 172K mile mark on truck now.
I know all vehicles have their issues, just passing along friends experiences. Not sure if theirs a maint fix that can prevent these issues or what, Kinda like the EGR Deletes on the 6.0's or changing the coolant on GM's when they were eating gaskets etc.