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Old 02-14-2016, 09:05 PM   #71
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My gmc 1500 runs 195-200 not pulling anything. And with the camper around 210
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Old 02-14-2016, 10:24 PM   #72
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My gmc 1500 runs 195-200 not pulling anything. And with the camper around 210
Year?
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Old 02-17-2016, 10:15 PM   #73
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Its a 2014. Extended cab. I just get bored on the hr drive to work. I flipped through the read outs the other morning and it was 11 degree's and trans temp 198. I really don't understand it. I had the service tech at the dealer cheek the trans oil ever time said it is all ok. And it don't have that burnt smell. I really keep a eye on it. He said that if it gets too hot a warning will go off in my instrument panel.
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Old 02-17-2016, 10:28 PM   #74
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Originally Posted by danielabram71 View Post
Its a 2014. Extended cab. I just get bored on the hr drive to work. I flipped through the read outs the other morning and it was 11 degree's and trans temp 198. I really don't understand it. I had the service tech at the dealer cheek the trans oil ever time said it is all ok. And it don't have that burnt smell. I really keep a eye on it. He said that if it gets too hot a warning will go off in my instrument panel.
You seem concerned but I wouldn't be. Many transmissions of today are thermostatically controlled so they warm up quickly so they're in the desired operating temp range.
Also, some have multiple PIDs for transmission temps. You may be reading the sensor of the used hot ATF before it's pushed through the coolers. You may have another temp sensor available that may read 15-20 degrees cooler.
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Old 02-18-2016, 11:05 PM   #75
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Most light duty cars and trucks run around the coolant temp for trans temps. The HD trucks run a lot cooler due to big coolers. 8K Behind a Diesel truck they run 160-180 F max usually.
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Old 06-19-2016, 12:22 AM   #76
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I just installed a trans cooler this evening and tomorrow I install the Gage. I am planing on placing it into the test port and I read that its not an optimal spot and some say its good enough, the manufacture of the temp Gage states to use the test port so i'm not sure. I have also read a few posts where people stated that they duct tape the probe to the trans output line and as close as possible and it works well for them. Still not sure what my approach i will be tomorrow but I think i will be going with the test port on the side of the trans. Another thing I did that I read a lot of disagreements on is I did not bypass the original trans cooler on the factory radiator. The cooler installation manual also called this the optimal way to cool and it makes sense to me. What do you all think ?
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Old 06-19-2016, 01:07 AM   #77
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FWIW, a transmission tech told me he likes to see the temps get a bit above 212 from time to time. That is hot enough to boil out any moisture that has gotten into the fluid. The trans will "breathe" a bit as it cycles from cold to warm, and that can bring in humid air.
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Old 06-19-2016, 01:15 AM   #78
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212 is getting up there for a Allison. A Allison should run 100* above outside temp. Mrpep do u have a duramax? If so you should run a edge insight to monitor your truck period. It reads off the ecm. I last have a truck with gages also. I prefer the cts over gagues.
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Old 06-19-2016, 01:36 AM   #79
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FWIW, a transmission tech told me he likes to see the temps get a bit above 212 from time to time. That is hot enough to boil out any moisture that has gotten into the fluid. The trans will "breathe" a bit as it cycles from cold to warm, and that can bring in humid air.
160-180 is warm enough to cook off any moisture, it just takes longer than if it was at 212. If the truck is ran almost everyday moisture is not an issue. My Yukon sees temps to only 165 or so. So in your mechanics theory it should have 5 years worth of moisture in it. I assure you it doesn't.
Just putting this out there so no one gets worried their Trans is too cold.

Now, where his theory holds true is in motor oil of piston engines in fixed wing aircraft. But that's another story.
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Old 06-19-2016, 07:12 AM   #80
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I just installed a trans cooler this evening and tomorrow I install the Gage. I am planing on placing it into the test port and I read that its not an optimal spot and some say its good enough, the manufacture of the temp Gage states to use the test port so i'm not sure. I have also read a few posts where people stated that they duct tape the probe to the trans output line and as close as possible and it works well for them. Still not sure what my approach i will be tomorrow but I think i will be going with the test port on the side of the trans. Another thing I did that I read a lot of disagreements on is I did not bypass the original trans cooler on the factory radiator. The cooler installation manual also called this the optimal way to cool and it makes sense to me. What do you all think ?
Follow the instructions of the supplier. They have likely tested it throughly. Not bypassing could cause a drop in pressure and cause flow issues of the atf but I have not seen your set up. That would be worse than just the stock cooler.
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