RE: 727 vs 904
The 5.9 99 Durango has a variant of the 727 called the a518, or the 46rh / 46re. It's just a 727 with a tail housing overdrive, and an aux. valve body. The 5.2 Durango took the a500 (42re) and that would be more like a late model a904 with the added gear and lock up.