tranny temp
tranny temp
Elder User
Joined: Sep 2006
Posts: 622
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From: Lincoln, NE
If everything is stock happy is 190 or less. You can go 200, maybe a little over, thats a comfort zone thing, when towing. I would recommend if you are going to be doing a good amount of trailering to get an aftermarket tranny cooler. It makes a world of difference and can save your transmission from premature wear.
My own experience, now that temps are in the 30's, I haven't even seen the needle move in a month, since it only registers over 100. It can make that much difference.
My own experience, now that temps are in the 30's, I haven't even seen the needle move in a month, since it only registers over 100. It can make that much difference.
Senior User
Joined: Dec 2005
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Originally Posted by indebt
with the tru-cool mine does'nt go over 140 in the summer (95-100+ around here) now in winter it barely goes over 100
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NO! The lines go into the radiator so that the engine coolant REMOVES heat from the transmission oil. If you bypass this cooler your temps will go up.
The only time the 140 would be too hot is if that is °C. If that is °F, that's too cool. The trans is designed to run at about 170-200°F. Running as hot as 220°F won't hurt it one bit.
The only time the 140 would be too hot is if that is °C. If that is °F, that's too cool. The trans is designed to run at about 170-200°F. Running as hot as 220°F won't hurt it one bit.
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Originally Posted by Casey
NO! The lines go into the radiator so that the engine coolant REMOVES heat from the transmission oil. If you bypass this cooler your temps will go up.
The only time the 140 would be too hot is if that is °C. If that is °F, that's too cool. The trans is designed to run at about 170-200°F. Running as hot as 220°F won't hurt it one bit.
The only time the 140 would be too hot is if that is °C. If that is °F, that's too cool. The trans is designed to run at about 170-200°F. Running as hot as 220°F won't hurt it one bit.
I'm not saying 140 is too warm, I'm saying it seems warm based on an ambient temperature of 30*. If ambient becomes 110* then tranny may become....210*? Just installed my tranny cooler and temp guage...and I'm trying to figure all this out.
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Originally Posted by schmity
Uhhhhm.....if the engine coolant is warmer than the tranny fluid...how does it cool the tranny fluid?
Since I have some time on my hands, and access to thermocouples, I put one in the water on the bottom of the radiator and another in the top of the radiator. Just running around the water temperature where it is entering the lower hose was around 40-50°F, when the outside temperature was about 35°F. The temperature of the water going from the upper hose to the radiator was right around 200°F. I wasn't towing anything, but if I were I'd expect the upper and lower temps to go up, but the lower temp is almost always going to be colder than the trans temp.
Last edited by Casey; Jan 19, 2007 at 12:17 PM.
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Originally Posted by Casey
It's easy. The trans cooler is on the cold side of the radiator, where the air has already cooled the water. The water in the bottom of the radiator can be more than 100°F colder than the temperature of the water coming out of the engine. If the bottom were the same temperature as the top of the radiator, why would you even need the radiator?
Since I have some time on my hands, and access to thermocouples, I put one in the water on the bottom of the radiator and another in the top of the radiator. Just running around the water temperature where it is entering the lower hose was around 40-50°F, when the outside temperature was about 35°F. The temperature of the water going from the upper hose to the radiator was right around 200°F. I wasn't towing anything, but if I were I'd expect the upper and lower temps to go up, but the lower temp is almost always going to be colder than the trans temp.
Since I have some time on my hands, and access to thermocouples, I put one in the water on the bottom of the radiator and another in the top of the radiator. Just running around the water temperature where it is entering the lower hose was around 40-50°F, when the outside temperature was about 35°F. The temperature of the water going from the upper hose to the radiator was right around 200°F. I wasn't towing anything, but if I were I'd expect the upper and lower temps to go up, but the lower temp is almost always going to be colder than the trans temp.
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