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Transmission cooler or not Thread

Discussion in '3rd Gen Tundras (2014-2021)' started by Mad Max, Oct 12, 2020.

  1. Apr 26, 2021 at 5:07 PM
    #661
    JohnLakeman

    JohnLakeman Burning Internet Daylight

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    You ain't gettin' no joy. :rofl:
     
  2. Apr 26, 2021 at 5:09 PM
    #662
    Ruggybuggy

    Ruggybuggy New Member

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  3. Apr 27, 2021 at 6:26 AM
    #663
    Terndrerrr

    Terndrerrr it's good to get lost once in a while

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    Yep. I looked up a 2017 manual and checked my 2021 manual. They both say

    “To maintain engine braking efficiency and charging system performance when using engine braking, do not use the transmission in D. Transmission shift range position must be in 4 in the S mode.”

    Nothing about heat build-up in the TC. It’s all about engine braking.
     
  4. Apr 27, 2021 at 6:56 AM
    #664
    Dragracer_Art

    Dragracer_Art Well armed member

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    The mechanical fan behind the radiator pulls massive amounts of air through the grille at all times... so yes, even at a stop, the cooler is effective.
     
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  5. May 3, 2021 at 11:25 AM
    #665
    SSPey

    SSPey .

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    Maybe this doesn’t matter or can’t be answered, but if the final 10 minutes of towing raises pan temps to 230F due to low driving speeds and trailer repositioning (forward/reverse), is it best then for the transmission to let the truck idle in park for a few minutes or shut it off? Stock setup, no cooler added.

    After trailer repositioning, when I shut off the rig and keep the electrical system on, the recorded OBD pan temps stay high. No fluid is moving past the sensor and OBD temps stagnate. If I wait 5 minutes, then start it up and put in gear to move 10’ in my driveway, OBD pan temps show a very rapid drop, presumably just a slug of lower temp fluid moving past the sensor.

    I don’t understand the ATF path and cooling processes in relation to the sensor. I also feel like the OBD readings aren’t telling me what’s best for the transmission when fluid isn’t flowing.

    Bottom line: Does idling at the end of a “hot” drive on a stock setup do the transmission any good, or best to just shut it down?
     
  6. May 3, 2021 at 11:41 AM
    #666
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    Its always good to let The Mojo works itself out and Modulate the Temps with a little idle. Foot off brake reduces engine load, too.
     
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  7. May 3, 2021 at 11:51 AM
    #667
    BroTun13

    BroTun13 New Member

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    I would say to let it idle for a little while before shutting it down but I came from the diesel world where that was a must after a long pull to cool down the turbo. It would also let the trans temp come down as well. I haven't towed with the Tundra yet but I will be following the same technique for piece of mind.
     
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