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Old 03-18-2015, 11:24 PM   #1
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what should transmission temp be?

i have a bullydog tuner gt gas installed on my truck, 2008 ram 1500 5.7 Hemi.. it shows my transtemp as one of the options. i took a trip to colorado through some steep mountains and realized it was up to almost 180 at the highest temp... once i hit the down grade it dropped down to 140-150. i was not towing any type of trailer but do have 200-300 pounds in the bed and cab.

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Old 03-18-2015, 11:33 PM   #2
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Usually around 150* is normal, were you in tow mode, in the mountains, or in overdrive? That much weight shouldn't make a lot of difference.
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Old 03-18-2015, 11:37 PM   #3
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Usually around 150* is normal, were you in tow mode, in the mountains, or in overdrive? That much weight shouldn't make a lot of difference.
no tow mode or overdrive.. i was passing in higher gears but i wouldn't think that would hurt... its a Hemi.

i have a auto transmission but it shifts into 5ht usually when passing. i think avg speed was 80-85 or so...
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Old 03-18-2015, 11:49 PM   #4
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no tow mode or overdrive.. i was passing in higher gears but i wouldn't think that would hurt... its a Hemi.

i have a auto transmission but it shifts into 5ht usually when passing. i think avg speed was 80-85 or so...
5th gear is overdrive, and depending on grade, your trans temp might have been lower if you were using tow mode. Running at higher speeds will cause the trans to run a little hotter. I wouldn't worry about it since the temp returned to normal.
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Old 03-18-2015, 11:52 PM   #5
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5th gear is overdrive, and depending on grade, your trans temp might have been lower if you were using tow mode. Running at higher speeds will cause the trans to run a little hotter. I wouldn't worry about it since the temp returned to normal.
ok, thanks for the info.. how does tow mode and overdrive work? if i notice my trans temp getting higher through the mountains i can turn that on..? even if I'm not towing?
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Old 03-19-2015, 01:02 AM   #6
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ok, thanks for the info.. how does tow mode and overdrive work? if i notice my trans temp getting higher through the mountains i can turn that on..? even if I'm not towing?
Yes, there is a button in the end of your shift lever, push it once, you're in tow mode, this will light up on the lower right side of your instrument cluster. Press it again, you will lock out overdrive, this will also be indicated in the same place on your instrument cluster. Press once more, all indicator lights previously on will be off, and you will be back in overdrive. If you are in tow mode/overdrive off, turn off the ignition, upon restart you will be automatically back in overdrive, until you press the button again.
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Old 03-19-2015, 03:14 PM   #7
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An easy plug and play upgrade is to swap out for a 2500 trans cooler. It's bigger and bolts right up
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Old 03-19-2015, 04:37 PM   #8
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My 03 runs normal at 140 and will go 160-180 when playing hard. IMO it is all good as long as you stay under 210 for extended period's of time. Checkout a oil temp chart. There has been lots of threads on this subject.
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Old 03-19-2015, 04:39 PM   #9
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My temps incity are around 150-160 get to 165-170 on highway but I have an aftermarket converter and trans likely make for a little more heat. Running a 2500 cooler here. These temps are normal anything over 180-200 range worry
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Old 03-19-2015, 07:14 PM   #10
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This chart shows temp vs longevity of the transmission.
Attached Images
File Type: jpg Transmission Life Expectancy.jpg (35.7 KB, 19 views)
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