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Old 11-29-2018, 04:59 PM   #1 (permalink)
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Transmission temps

Whatís the average trans temp while towing in town.
Iíve got a 2005 2500 Dodge with the 4 speed. Towing 6000 pounds or so Iíve seen temps up to 225.


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Old 11-29-2018, 05:38 PM   #2 (permalink)
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My rule of thumb is ambient outside temp. +100 degrees more than max temp of transmission. I was taught that if your cooler can’t keep up with that formula you need more cooling capacity.

All that said it really depends on the fluid your running. I run Amsoil’s version of TES-295 in my Allisons and it has a pretty high max temp before it starts to break down. Seeing 225* on occasion wouldn’t concern me if I’m pulling hills and then it comes back down, but I wouldn’t want that to be my running temp in stop and go traffic.

Just my opinion here, I’m sure others will chime in.
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Old 11-29-2018, 05:55 PM   #3 (permalink)
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225 in town with the converter unlocked is about right. I would not be concerned. If you start creeping on 240 I would be worried. I like to run hytran on stuff with loose converters. Keeps temps down and lowers the stall a couple hundred rpms.
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Old 11-29-2018, 06:01 PM   #4 (permalink)
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Thanks for the input, Iíve replaced both coolers in the last year and filter. Havenít thought about a torque converter.


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Old 11-29-2018, 06:20 PM   #5 (permalink)
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I like to stay below 200, preferably 150-160 range. I've been trained by GM 1/2 ton transmissions to keep them cool or replace clutches.

Mostly fluid dependant, keep it below the fluid burning temp and I doubt you have problems.
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Old 11-30-2018, 08:21 AM   #6 (permalink)
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IT really depends on where you are measuring the temp at.
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Old 11-30-2018, 09:03 AM   #7 (permalink)
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IT really depends on where you are measuring the temp at.
This for sure. Where are you measuring? Pan or lines?
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Old 11-30-2018, 09:10 AM   #8 (permalink)
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Whatís the average trans temp while towing in town.
Iíve got a 2005 2500 Dodge with the 4 speed. Towing 6000 pounds or so Iíve seen temps up to 225.


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04 here - sensor in the pan (Derale deep pan), never hit above 180 towing 5K in the summer.
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Old 11-30-2018, 09:33 AM   #9 (permalink)
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Transmission temps

Iím getting the temp from a Edge Tuner and monitor. So Iím not really sure where itís getting the temp from. Iíll have to look. The thing has a torque convertor cooler thatís liquid cooled. So if Iím right it should be at least the temp of the oil. I never seen either one below 180, during the cold months I let it warm up to 180 before we go anywhere.


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Old 11-30-2018, 09:53 AM   #10 (permalink)
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Quote:
Originally Posted by Mac7 View Post
Iím getting the temp from a Edge Tuner and monitor. So Iím not really sure where itís getting the temp from. Iíll have to look. The thing has a torque convertor cooler thatís liquid cooled. So if Iím right it should be at least the temp of the oil. I never seen either one below 180, during the cold months I let it warm up to 180 before we go anywhere.


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that sensor is on the valve body so its pan temp. heat exchanger is coolant cooled/heated.
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Old 11-30-2018, 10:25 AM   #11 (permalink)
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Quote:
Originally Posted by Mac7 View Post
Iím getting the temp from a Edge Tuner and monitor. So Iím not really sure where itís getting the temp from. Iíll have to look. The thing has a torque convertor cooler thatís liquid cooled. So if Iím right it should be at least the temp of the oil. I never seen either one below 180, during the cold months I let it warm up to 180 before we go anywhere.


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Sounds goofy to me, something in wrong.

I have my sensor on the HOT OUT line of the transmission, IT gets to 200-220 when towing up long grades where the converter is not locked.(2005 RAM).

I drive about 50 miles to work, it's only 50 degrees out, and with no load, that temp never really goes above 120.
All I have is a deep pan.
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Old 12-02-2018, 06:04 PM   #12 (permalink)
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I’m getting the temp from a Edge Tuner and monitor. So I’m not really sure where it’s getting the temp from. I’ll have to look. The thing has a torque convertor cooler that’s liquid cooled. So if I’m right it should be at least the temp of the oil. I never seen either one below 180, during the cold months I let it warm up to 180 before we go anywhere.


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That's reading off the transducer in the valve body, it's known for not being accurate. I just rebuilt my 48re, my transducer runs about 20-25* hot.
When you've had a stable temp outside overnight, turn your key on and wait for the edge to tell you trans temp, compare that to the outside temperature.
It was 10* since yesterday and overnight last night, when I started my truck at 10am this morning my smarty read 35*.
Get a heat gun to verify pan temp, then just know the temp you're off.
My truck runs down the highway at 165-185, so really 145-165.
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Old 12-02-2018, 08:35 PM   #13 (permalink)
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Originally Posted by wheelin66bronco View Post
That's reading off the transducer in the valve body, it's known for not being accurate. I just rebuilt my 48re, my transducer runs about 20-25* hot.
When you've had a stable temp outside overnight, turn your key on and wait for the edge to tell you trans temp, compare that to the outside temperature.
It was 10* since yesterday and overnight last night, when I started my truck at 10am this morning my smarty read 35*.
Get a heat gun to verify pan temp, then just know the temp you're off.
My truck runs down the highway at 165-185, so really 145-165.


This is what Iíve been looking for. Thank you for the info.
Also Iíve spoke to a few folks around here with the same trucks and they arenít worried at 220 especially if the truck isnít throwing a code.



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Old 12-04-2018, 06:52 PM   #14 (permalink)
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This advice was spot on. Thanks again!


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Old 12-04-2018, 08:33 PM   #15 (permalink)
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is the fluid brown and burnt smelling?
Yes? change it
No? it's fine

If you're changing it more than every 20k miles, you might want a better cooler.

deep pan doesn't really gain you anything, the thermal mass of a gallon of extra fluid is nothing compared to the mass of the trans case and everything
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