If that Durango tends to sit a lot, it may have the converter drain back and flood all the seal problem. Lots of trans cooler line leaks. The OEM cooler line has a crimped rubber hose in the line near the radiator that houses that anti drain back check ball (there is rubber there if the check ball is present or has been removed). Most of them I've seen were wet on one end or the other, but the low point is near the starter, anything less then a major leak will drip off the line near the trans bell.