You can not group all Mopar transmissions into one category!
THe 42 RE's in some of the trucks are more prone to problems and will wear out faster than the 46RE's.
The 545 RFE is a totally different animal and is considered to be one of the better automatics which have been developed in recent years.
Too many people on all these web boards extrapolate outdated data and make too many generalities. IE, the old A604's in the vans were very problematic, especially
the 90-94 flavor. So all DC trannies are bad.
Best bet is to change the fluid, use either the ATF+4 or ATF +3 depending on application or run the Amsoil.
Note, I have two freinds who are techs and service managers, they have never ever turned down a warranty claim on a tranny or engine, within the 7/70 power train warranty because of the fluid used in the engine or tranny. They also told me they have never bothered nor do they have time to determeine the type of fluid used. As my friend told me, 90% of the time when there is a trany failure, the people have never bothered to changed the tranny fluid.
In the case of the engine, they only check to see if there is oil in the engine and may ask questions if the stick shows the engine was drastically low. If that is the case when they open it up, they will investigate. Also if the customer is a good repeat customer, they are going to warranty it period! The number of failures are rare in his opinion, engines and manufacturing processes are very good these days. He commented that Honda seems to have the most issues with their transmissions these days, his group has a Honda and Acura store and he told me the Odyseys, Pilots and MDX's have a lot of issues with transmissions, many more than the Dodge or Jeep he servics in the last few years.
VNT