I can attest to the Ram transmission problems, after only about 115k miles the rear differential and the transmission started to go out on my old 98 Ram. I've also had the worst luck when it comes to water pumps as I'm currently on my third one. The problem stems from the fact (IMO) that Chrysler uses shoddy parts in their cars which has caused so many problems. My father owned a 95 Jeep Grand Cherokee that went though 3 transmissions before it hit 80k miles. He's also had nothing but problems with his 04 Grand Cherokee as well.
Don't get me wrong I do love my Ram, however, I make no bones about it that you will have problems if you get a Dodge made in the last decade.