Allison ATS transmission running hot - Chevy and GMC Duramax Diesel Forum
Transmission Shop Discuss the Allison OEM, aftermarket, and the ZF-6.

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post #1 of 53 (permalink) Old 11-03-2019, 03:44 PM Thread Starter
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Allison ATS transmission running hot

I have an ATS transmission in my 2008 GMC 2500hd duramax. This was in the truck when I bought it at 99k miles. It has 130k on it now. It was running hotter then I liked it to so I changed the fluid and external filter. Didnít fix the problem so pulled the stock trans cooler and put in the PPE transmission cooler. Still no fix, not sure what to do next. Dip stick is hard to read so I made sure the fluid wasnít too high. Even went by a trans shop and had them check the fluid levels.
Not sure what to do now. Any help would be great.
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post #2 of 53 (permalink) Old 11-03-2019, 04:58 PM
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Welcome to the forum!! How hot is "hotter than I liked it"? Do you see high temps while in stop and go traffic? Are you sure the gauge is reading OK? Do you tow anything? Are you using an aftermarket grille? Have you tried cleaning the cooling stack? (search for how to). Is the dipstick tube fully seated? What year? Is it a 5 speed or 6 speed? Did the ATS trans replace a trans with burned clutches? If so, you might have burned clutch debris clogging the radiator heat exchanger.
You might provide some clues on what you have so folks can help figure it out.....
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post #3 of 53 (permalink) Old 11-03-2019, 05:08 PM
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Quote:
Originally Posted by Trowbs127 View Post
I have an ATS transmission in my 2008 GMC 2500hd duramax. This was in the truck when I bought it at 99k miles. It has 130k on it now. It was running hotter then I liked it to so I changed the fluid and external filter. Didnít fix the problem so pulled the stock trans cooler and put in the PPE transmission cooler. Still no fix, not sure what to do next. Dip stick is hard to read so I made sure the fluid wasnít too high. Even went by a trans shop and had them check the fluid levels.
Not sure what to do now. Any help would be great.
I believe it says 2008 which would be a 6spd..

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post #4 of 53 (permalink) Old 11-03-2019, 05:20 PM
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Built transmissions tend to run a little hotter correct? So what is the actual temp your talking about?

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post #5 of 53 (permalink) Old 11-03-2019, 06:10 PM
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What about the internal filter ?
Lasting a lifetime theory went out years ago.
What are the outside temps where your located, Iíll also throw in what are these trans temps running that your concerned about.
What fluid did you use? Did you contact ATS asking what fluid do they recommend.

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post #6 of 53 (permalink) Old 11-03-2019, 06:48 PM Thread Starter
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Well from what I read standard operating temp is 180-200 or 100 degrees over ambient temp. Yesterday it was 80 degrees and it got to 228 driving around town. Last weekend I ent up to the mountains where it was in the 70ís and 60ís. And going up the mountain it got to 240 and my programmer goes into defuel so I would pull over and let it cool down. I have the dash temp and the programmer reads temp as well. I donít know if they read from the same spot or not. As for the transmission clutch debris I have no idea. I was told it was upgraded for towing. It is a 6 speed I used valvoline dexron 6
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post #7 of 53 (permalink) Old 11-04-2019, 08:25 AM
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Quote:
Originally Posted by Trowbs127 View Post
Well from what I read standard operating temp is 180-200 or 100 degrees over ambient temp. Yesterday it was 80 degrees and it got to 228 driving around town. Last weekend I ent up to the mountains where it was in the 70ís and 60ís. And going up the mountain it got to 240 and my programmer goes into defuel so I would pull over and let it cool down. I have the dash temp and the programmer reads temp as well. I donít know if they read from the same spot or not. As for the transmission clutch debris I have no idea. I was told it was upgraded for towing. It is a 6 speed I used valvoline dexron 6
Most built transmissions use dex 3, you should contact ATS and confirm.

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post #8 of 53 (permalink) Old 11-04-2019, 11:11 AM
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The biggest problem is its purple. Might be a blockage in a line to the cooler. Did you flush them when you changed the cooler? Could be the convertor isnt locking up as that will generate the most heat. Anyway to see if convertor is locking? Try driving in towhaul as the comverter will engage must sooner (between 2nd and 3rd usually vs 5th when not in towhaul).

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post #9 of 53 (permalink) Old 11-04-2019, 11:12 AM
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Quote:
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Most built transmissions use dex 3, you should contact ATS and confirm.
Dex 6 wont hurt a built trans, dex 3 is just more grippy iirc. I run dex 3 but was told that its fine to use dex6 like transynd.

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post #10 of 53 (permalink) Old 11-04-2019, 05:31 PM Thread Starter
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ATS said I should run Dex 3 and up
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