Thought I would update this as things have changed a bit.
Went to do the flush and new coolant today, drain was stuck again, sprayed with the WD-40 and it opened again and drained, closed it up and put two bottles of flush in and thought I better look under, sure enough draining all over the driveway. It closed and felt fine but would not seal.
Called a radiator shop in the next county and he said fairly common, he had my radiator in stock. Used my new truck and went over and picked it up(by the way the exhaust brake on the new Dodge is the best thing I've every used) anyway I took the old one out and checked the drain, the sides of the radiator is plastic and the drain also but the knob and shaft are metal. As I looked at the knob I saw something sticking out, I picked at it and finally got it out, a piece of rubber o ring, can't see where it came from but was the problem, can see no way to replace the valve or o ring.
Although I wasn't real happy about replacing the radiator it should outlast this truck.
Within two weeks I've replaced rotors,pads,wheel cylinders,brake springs, computer,two sensors and now the radiator, this truck has never given me a problem in twelve years and has been taken very good care of. I'm almost afraid to start it again but who knows, might go another twelve years with out another problem.
