2001 Dodge Durango RT...?

The biggest problem with those transmissions isn't the transmission itself. It's that when Dodge built the trucks, they didn't give the transmission adequate cooling ability. Spending $100 on an aftermarket transmission fluid cooler (which coincidentally holds a couple more qts of fluid) will go miles for making them reliable. In fact, from experiences of family members, this one modification alone can take it from a questionable transmission to very reliable. Another thing that can be done to prevent any issues, is to get some sort of aftermarket programmer or shift kit. This will make the shifts more firm, so you will feel them a bit more, but this will reduce the slipping in the transmission (all automatic transmissions slip when they shift, it's part of the design. The softer the shift, the more they slip.), and the slipping is what heats up the transmission. So reducing the heat in the transmission, coupled with increased cooling capacity will make it a superbly reliable vehicle, and it won't cost much.

you usually won't have no problem once one of them has been redone,because ever who does them knows what to do to make one last,like the above answer told you cooling is important but its not the only part of it,those transmissions are basically electrically shifted and even with a rebuilt one you can still experience problems from one,so make sure they offer some kind of a warranty on what work their doing to it,if not a year later you may be having it redone again,at your expense,good luck