One thing that should be done is a filter and fluid change at 50,000 miles. Dodge did at one time used a external transmission fluid cooler that was the size of a gallon zip lock bag and they are known for bursting. Unfortunately mopars have had serious transmission problems for a long time, I don't know if they have corrected any of them or not. The best way to extend the transmission life is regular maintenance and a deeper transmission pan and a external oil cooler.
