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Did you flush the entire cooling system, engine and all?

If not you need to. But from what you said you did. So we go one to the next thing, thermostat. It can still be bad, try running it without the stat. you could have a bad one.

Then there is always the dreaded head gasket. Is it loosing fluid?

Unless you have owned this from new someone may have put some type of sealant in the system trying to fix a leak and if not done properly that can plug cooling passages.

Just guessing here.
 

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I need a little more info to help you out.
Is it overheating all the time, or just in stop and go traffic?
What does it do while driving at 55+?

Does the temp creep up or does it just peg the guage after driving it for a few minutes?

And like 84Fiero said, are you loosing water?
 

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Another thought..... Is the radiator the original or has it been replaced. The cooling system may not be flowing completely through the radiator, thus returning still hot.

Another thought.....the transmission could be running hot and overheating the cooling system, however the 7.4 2500's should have a tranny cooler///


Just a thought
 

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Ya, normally overheating at low/no speeds is an airflow issue. And overheating at 40+ is a volume/capacity issue. That's assuming everything else (pump, stat, ect) is in working order.
 

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Easy to do

The DIY network has a great article on flushing the cooling system. Complete with a video. See it at DIY.com
 
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