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Discussion Starter · #1 ·
I know the air temps are going up so i know the fluid temps will go up, but what is your auto tranny temps not pulling but racin around the city? mine hit 180 for the first time today. (95 degree day)
 

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Mine usually runs 150 to 170 with the truck fully warmed up. I have never seen mine hit 180...Im not sure what normal temp is...
 

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I'm around 140 driving around town. :popcorn:

I think conventional atf starts to boil and burn around 220 degrees.
 

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Discussion Starter · #4 ·
I'm around 140 driving around town. :popcorn:

I think conventional atf starts to boil and burn around 220 degrees.
well, it was pretty hot today and i dont have a deep tranny pan...i think ill be looking into one of those.
 

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well, it was pretty hot today and i dont have a deep tranny pan...i think ill be looking into one of those.
I'd like one too, having a few extra quarts of fluid wold be key :thumbsup
 

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180 is okay, you really dont need to worry until you get above 200, then when you stop just put it in N.

Were are you getting your temp from, before or after it is cooled?
 

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your temp should be coming from the a sending unit in tapped into your tranny pan.
 

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Discussion Starter · #8 · (Edited)
your temp should be coming from the a sending unit in tapped into your tranny pan.
thats where mine is tapped that leads up to my gaug

EDIT**** well, i know part of my problem, my tranny pan is leaking i noticed slightly, and checked it just barely running in nuetral and its probably a full quart low.. that'll do it.
 

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i did a little drag racing with some buddies the other day in an open pasture, about 6 or so times in a row and mine went to 214 for a minute or so then sat at about 204 for about 5-10 minutes
i beat my buddies duramax so it was worth it
do you guys thing i hurt anything
 

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Mine is tapped into one of the tranny lines. I'm running amsoil and if I let it idle too long or in stop and go traffic I have seen 210-220 on a few occasions. Even being this hot the tranny still shifted fine. I also have a deep tranny pan.
 

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Transmission temperature gets well over 200 degrees in the hot line after a few seconds of powerbraking. It won't register in the pan, because the hot fluid in the pan is diluted with a lot of cool fluid.

Just because the pan temperature is a safe temperature doesn't mean that you're not getting to fluid-burning temperatures in the hot line.

You're probably not getting to fluid-burning temperatures in the hot line, though, cosidering that fluid burns above 250 or something. But it's possible to burn fluid in a sustained powerbrake without the pan-temps ever blinking.
 

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your temp should be coming from the a sending unit in tapped into your tranny pan.
Pan temps are the lowest in the system, you're much better off measuring the temp in the output line to the coolers. Even the stock idiot gauge sensor is located in the output line or in an area of the tranny right before it.
When I switched from a pan sensor to one in the output line I saw about a 50F increase in temps.
Beware if your sensor is in the pan, likely your fluid temps are higher than you think.
 

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:agree2: The cooler line tells you what the temp in the trans machinery is. That's what is important.
 

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i did a little drag racing with some buddies the other day in an open pasture, about 6 or so times in a row and mine went to 214 for a minute or so then sat at about 204 for about 5-10 minutes
i beat my buddies duramax so it was worth it
do you guys thing i hurt anything
I don't think so. If it was only that high for a little while and cooled back down. If was hot for a long period of time then I would be worried,but I don't think that 10 mins is something to worry about, what do you guys think.

I agree, I put my temp senor right before it goes in the cooler, it makes me feel better that I know what the hotest part of the trans is running at.
 

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i did a little drag racing with some buddies the other day in an open pasture, about 6 or so times in a row and mine went to 214 for a minute or so then sat at about 204 for about 5-10 minutes
i beat my buddies duramax so it was worth it
do you guys thing i hurt anything

I hit the same temps as you but way faster. I hit 205 last week going up a windy, steep road for a few miles. It sounds like the edge runs off the stock sensor in the hot line. Whats a good temp we should stay under knowing that?
 

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Mine almost hit 260 yesterday but I was on heavy stop and go traffic on the way to opening day. Trans still shifted just fine no slipping. On the open freeway it got just above 200
 

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I have my sensor in the line going to the back of the transmission and it shows temps of about 150-160 cruising down the high way on hot days and I have seen 200 in stop and go traffic. If i leave the truck in any gear other than park while in stop and go traffic it heats up pretty decently on hot days , once I put it into park or neutral and high idle it it will start to cool back down.
 

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Mine is taped in one of the ports on the case were edge tells you to put it and it normally runs 180-190 in town racing around. I was out playing on some rocks last summer 92deg out side and it stayed at 245 for about an hour thats the hottest mine has ever been.
 

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Transmission fluid temperature readings are supplied to the transmission control module by the thermistor (Fig. 238). The temperature readings are used to control engagement of the fourth gear overdrive clutch, the converter clutch, and governor pressure. Normal resistance value for the thermistor at room temperature is approximately 2000 ohms.

The thermistor is part of the governor pressure sensor assembly and is immersed in transmission fluid at all times.

OPERATION
The PCM prevents engagement of the converter clutch and overdrive clutch, when fluid temperature is below approximately 10°C (50°F) .

If fluid temperature exceeds 126°C (260°F) , the PCM causes a 4-3 downshift and engage the converter clutch. Engagement is according to the third gear converter clutch engagement schedule.

The overdrive OFF lamp in the instrument panel illuminates when the shift back to third occurs. The transmission will not allow fourth gear operation until fluid temperature decreases to approximately 110°C (230°F) .

So opperating temp is about 140° to 230°
 
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