I recently bought a 2004 Dodge 3500 Cummings with 4 wd and auto trans. I drove it for a couple of weeks hauling several loads of hay on a 32 ft gooseneck and had no problems. Well diesel got high and I parked it for 2 weeks while I drove something a little cheaper. When I started it back up approx. 2 wks later the trans. wouldn't shift-it wanted to stay in low until the engine temp. finally reached about 195 then it would shift to 2nd but not to high. Anyone have any idea what happened while it was sitting? Worked fine before I parked it.???