tranny overheating while towing - Ford Powerstroke Diesel Forum
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Old 04-17-2013, 01:34 PM
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tranny overheating while towing

I have an 03 f250 7.3 auto, just bought it about a month ago. 94,000 miles on it. the truck runs fine until I pull something and the temp gauge goes to the red, and you can smell it outside the truck. If anyone knows how to fix it, let me know. thanks
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Old 04-17-2013, 02:08 PM
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WOW, in the RED on our gauge it too late, the fluid is shot for sure, hope not the trans too

dieselmann's editorial

Verify the cooler and bypass are functioning first, but it could just be that the frictions are slipping when loaded and overheating because they're worn-out...
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Old 04-17-2013, 02:14 PM
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Well, this happened about a week ago, and still driving fine and shifting good. I wonder if I should have the whole system flushed out and install new fluid?
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Old 04-17-2013, 02:22 PM
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If you have the stock tranny cooler, consider going to a 6.0L cooler. See the difference (6.0L on top):

One of the best things I did to my truck! Pulling my 12K 5er, I could easily peg my gauge going up grades in the summer. After the new cooler, it gets warm, but nowhere near pegged.



If you do that, blow out the lines to make sure they are clear. You could also check to see if you have an inline tranny fluid filter. It might be clogged or getting that way. Any idea on how long the fluid has been in there? Maybe time for a fluid change.

Just some ideas.
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Old 04-17-2013, 02:29 PM
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Well, I bought an after market cooler, but haven't installed it yet. Its about the size of the 6.0. I don't know much about the truck, I just bought it and it has 94,000 miles. When it got hot, it went to the yellow mark. I hope this didn't hurt the tranny! I am going the change the fluid soon. Thanks!
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Old 04-17-2013, 05:09 PM
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After I bought the truck I dropped it off at the dealer and had them go over it good and solid like. While doing that I also had them flush the tranny. Flushes are good. After that was done, I dropped the pan, put in a different valve body and changed the internal filter as well. Even the dealer said not to worry about the filter. I smiled and nodded, and changed it anyway, because it's a filter. They filter, which means they get clogged over time.
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