I have a 2000 Ram 2500 and a 2006 Ram 3500 both trucks started leaking at the trans cooler/hose connection. Quick connect, great idea but Dodge engineers screwed this one up. My first trial was with the 2500. Tranny shop found the leak but not at the hose, was on the tranny cooler line. The SS clamp inside the hose end eats into the soft aluminum of the cooler. The leak happens just inside the hose end directly before the O-ring seal. With all the vibrations of a Cummins, it's a ticking time bomb. Had to replace the cooler and the line. $500.00, Thanks Dodge.
Second time around, on the 3500, same thing happened. I wasn't messin' with the stock set up this time. Went down to the local hydraulic hose shop and purchased some aluminum nuts and welded them to the damaged ends of the tranny cooler. The nuts cost about $5.00. Saved buying a new cooler. Reinstalled cooler and took the measurements for the new hydraulic hoses. They made me custom hoses that fit the new nuts on the cooler side and matched the stock fittings on the tranny side, about $30.00. There is also a check valve on one of the stock hoses which is a joke, 1/4" I.D. on a 7/16" line, that's real smart. I was able to get a 1/2" I.D. check valve that matched the 1/2" hyd hose to improve flow for another $20.00. Took me half a day to do all the runnin' around but I don't think I will ever be stuck dripping/pouring tranny fluid on the side of the road ever again.
You could easily blow a tranny on this factory mistake. I lost over one gallon of fluid in 15 miles. It was a fluke that I stopped and noticed the trail I was leaving behind. Another 30 minutes of driving and I would be shelling out six large for a new tranny.