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Message: [QUOTE="HBDELUX, post: 429017, member: 3727"] Bottom line: My heat issue building at speed was not that the first 6.0 cooler had an air pocket/bubbles. The pan and exhaust were not the issue either. What did happen was a bunch of aluminum milling/shavings from inside the Trans or TQ converter when it was Rebuilt/modded and installed pumped in that 6.0 cooler and it restricted the flow through the cooler. The flow was restricted enough to cause heat to build at increased rpm. Before anyone says the aluminum shavings were from the prior trans. They were not. Prior Trans and coolers were removed, the radiator cooler was also blown out [B]plus bypassed[/B]. I'm bought a new 6.0 cooler & threw it in after changing fluid & cleaning pan out twice. I have no more heat issues. My hopes: The Trans was not damaged during the summers I spent figuring this out. Food for thought: I now see how If you had that Bypass eliminated your trans could be toasted before you could react to any sign on your Trans Temp guage. Listen to MARK K. [/QUOTE]

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