"The big news is the introduction of the 48RE automatic that will be available as an option with all the diesels and the V10. Currently, buyers who want the higher output Cummins can only get it with the 6-speed manual. The reason is simple, the current 47RE just can't handle the massive amounts of torque generated by the diesel. To solve this problem
Dodge has seriously beefed up the internal components to allow it better manage the torque loads. For the first time the highest output diesel will be available with an automatic. That's the good news, the bad news is that you'll have to wait until January of 2003 to get one."