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Torque converter 250 degrees when towing

Discussion in 'Tundras' started by 15Tundra4.6, May 24, 2021.

  1. May 24, 2021 at 9:44 PM
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    15Tundra4.6

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    15Tundra4.6 [OP] New Member

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    So I've been trying to figure this out for a while now I got my 4.6 2015 tundra and I'm pulling a 5200 lb toy hauler with a couple ATVs and when I'm going uphill if I'm not in 4th gear my torque converter gets up to 250° my oil temperature 219 which isn't bad and they say that these transmissions are supposed to run at a warm transmission fluid temperature to thin it out but with my torque converter getting that hot should I be worried and what do you think I could do to fix that I have a aftermarket transmission cooler with fan that only seems to help when I'm stopped.
     
    15Tundra4.6, May 24, 2021
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  2. May 24, 2021 at 9:51 PM
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    Bishop84

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    Bishop84 Well-Known Member

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    Manual says 4th S mode, and 65 mph is ideal. There's not much else you really can do except make sure the trailer bearings and brakes are in good order.
     
    Bishop84, May 24, 2021
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  3. May 26, 2021 at 8:52 AM
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    specter208

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    specter208 Well-Known Member

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    Does your truck come with a towing package with factory installed trans coolers?
     
    specter208, May 26, 2021
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  4. Oct 7, 2021 at 5:12 PM
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    USMILRET

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    USMILRET Tacoma Owner

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    You can always drop it into a lower gear to cool the transmission down. Heat is produced at the torque converter vs the rest of the transmission.
     
    USMILRET, Oct 7, 2021
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  5. Oct 7, 2021 at 5:21 PM
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    rnish

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    rnish Well-Known Member

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    You can slow down. Check a trans fluid temperature vs life span chart. ~220F you are starting to eat into the fluids lifetime.
     
    rnish, Oct 7, 2021
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  6. Oct 29, 2021 at 4:03 AM
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    gearcruncher

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    gearcruncher Well-Known Member

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    Anytime the converter is out of lock up , you are creating an abundant amount of heat . Throw a transmission cooler at the truck and as mentioned above , use 4th gear to keep the clutch inside the torque converter locked up . If you have a scan gauge , you can see when your converter locks and unlocks
     
    gearcruncher, Oct 29, 2021
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