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Tundra Transmission Cooler Kit

Discussion in '3rd Gen Tundras (2014-2021)' started by chasenicholas93, Jan 19, 2020.

  1. Jun 7, 2021 at 1:16 AM
    #691
    sd172

    sd172 New Member

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    I believe all of the Sequoias lost the external ATF cooler back in 2010 when the tow rating dropped from 9+ to 7000 pounds. Toyota had plenty of time to test this setup. There’s plenty of 200000 mile 2nd gen Sequoias running around today, but the percentage of people towing with an SUV is a lot smaller than with the truck. I still don’t feel like the transmission warmer / heat exchanger is sufficient enough especially if you decide to do a lift and 35 inch tires.
     
    Saltyhero13 likes this.
  2. Jun 7, 2021 at 6:02 AM
    #692
    Mad Max

    Mad Max New Member

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    Wow manual does say tow in S4 and no faster than 65 mph. Looks like an external cooler isn't needed at that snail pace.
     
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  3. Jun 7, 2021 at 6:31 AM
    #693
    dt325ic

    dt325ic New Member

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    Did the wording in the manual change between 2018 (cooler) and 2019 (no cooler)? Can someone with a 2018 or earlier verify this?
     
  4. Jun 7, 2021 at 8:31 AM
    #694
    sask3m

    sask3m New Member

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    I've always towed my 6500 5th in 5th gear with t/h engaged at around 65, unless I hit some mountain passes. That's going back to 2012 first with my 08 and now with my 19. The 65 is more on account of trailer tires than anything as I've read many issues when towing at high speed, like blowouts. Oh and gas mileage.:thumbsup:
     
  5. Jun 7, 2021 at 8:36 AM
    #695
    SSPey

    SSPey .

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    Did the Sequoia move to an integrated condenser/transmission cooler like the Tundra, or did it go to no transmission cooling way back in 2010?
     
  6. Jun 7, 2021 at 8:42 AM
    #696
    Mad Max

    Mad Max New Member

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    I agree S5 with T/H is the sweet spot as I pull my 5Klb boat between 68-72 (2400 rpms). If on smooth flat road S6 at 75-78 (2400 rpms). My trailer tires rated at 85 mph.

    Keeping RPM above 2K negates alot of the shifting up and down. So you can hold in lower gear or go faster to get above 2K rpms
     
  7. Jun 7, 2021 at 8:42 AM
    #697
    sd172

    sd172 New Member

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    2nd gen Sequoias initially had the integrated A/C condenser and ATF cooler just like the Tundra and my previous 2018 Tahoe 5.3 with max tow package. Since 2010 only the hockey puck.
     
  8. Jun 7, 2021 at 1:08 PM
    #698
    SSPey

    SSPey .

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    I’m confused now.

    The 2nd gen Tundra had a separate cooler 2007-2010, then integrated cooler 2010-2018, then puck only 2019-2021. I would have thought the Sequoia with Tow Package would be the same, but maybe you are talking about Sequoia without tow package having only the puck since 2010?
     
  9. Jun 7, 2021 at 1:35 PM
    #699
    sd172

    sd172 New Member

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    You are right. Just found a picture of used 2010 Platinum with ATF cooler lines in the front. Must be the one with towing package.
     
  10. Jun 8, 2021 at 4:38 PM
    #700
    Azbackcountry

    Azbackcountry New Member

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    What a fantastic kit. Phoenix ambient temps are forecasted for 117 next week☀️.
    Already noticing SIGNIFICANTLY lower temps on the pan. Ready to tow with confidence.
    In March from Page Az to Flagstaff , I saw 270 degrees with a 3,000 lb trailer ( no cooler)
    Thank you!

    33DC6D97-FBFF-4573-B6E2-8AC0BF3B24FA.jpg
    9AF84882-CF4B-475D-A935-F4D39D653CBF.jpg
     
    Last edited: Jun 8, 2021
  11. Jun 8, 2021 at 4:52 PM
    #701
    Mad Max

    Mad Max New Member

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    that is HOT HOT HOT!!!!!!!!
     
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  12. Jun 8, 2021 at 7:24 PM
    #702
    Acedude

    Acedude New Member

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    I'm pretty sure the 5.7l engine, be it Tundra or Sequoia, had the auxilliary trans cooler through 2018. The 4.6l engine did not have the aux cooler, maybe that's what you're thinking of.

    @Terndrerrr has been mentioning the new AC refrigerant necessitated the deletion of the air-to-liquid external ATF cooler, don't know why it would be so.

    Anyway, the chasenicholas kit gets rave reviews and apparently doesn't affect the AC at all, so FU Toyota and good on chasenicholas. I ordered the kit but don't know if it has been installed. The '19 Seq I bought was donated to an animal rescue outfit and I'm not a "helicoptor donor" so to speak, I buy vehicles and recommend enhancements. It's up to them to do it or not, I don't hover around trying to micro-manage. They have so much on their plate I don't be annoying asking if they used the napkins.
     
  13. Jun 8, 2021 at 8:58 PM
    #703
    AzureNightmare

    AzureNightmare Geek in a Tundra

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    Not all 5.7s had the tow package. Those without it didn't have the cooler or the tow/haul button. Later on all 5.7 Tundras did get the towing package with the tow/haul button, cooler, and eventually the integrated trailer brake controller, but 2019+ the coolers were dropped from ALL Tundras.
     
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  14. Jun 8, 2021 at 9:19 PM
    #704
    Terndrerrr

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

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    I'm not sure if that's official info or forum speculation, but apparently...
    The air-to-liquid cooler went missing right when they switched to more eco-friendly (and apparently less efficient) refrigerant. More info here:

     
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  15. Jun 8, 2021 at 9:55 PM
    #705
    SSPey

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    Terndrerrr likes this.
  16. Jun 8, 2021 at 10:43 PM
    #706
    sd172

    sd172 New Member

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    I was referring to this video where the 2012 Platinum Sequoia 5.7 4x4 didn’t have the external trans cooler which was retrofitted:
    https://youtu.be/41UM0Hg1-Wc
    https://youtu.be/YF2Y8TXw990
    I understand the attempt to get more views and refer to that vehicle as Toyota Tundra.
     
    e30cabrio likes this.
  17. Jun 9, 2021 at 6:41 PM
    #707
    773_eddie

    773_eddie Trd Pro

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    Finally Installed my Trans Cooler with Hard Lines
    19795CBF-86DE-49A2-8BA9-E81BEBF30373.jpg 8378EB89-52AC-4EE4-A155-EE676647318A.jpg
     
  18. Jun 9, 2021 at 9:35 PM
    #708
    Acedude

    Acedude New Member

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    Thanks much for the BITOG link. Very nice that the OP provided a Blackstone report on page six. So, taking the OP at his word the factory-fill WS is durable on a 2019 for at least 18k miles towing 7k lbs occasionally and reaching 260 degrees pan temp sometimes. Chasenicholas kit is still the way to go IMO.
     
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  19. Jun 11, 2021 at 5:39 AM
    #709
    eagleguy

    eagleguy New Member

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    What exactly does the tow/haul button do?
     
  20. Jun 11, 2021 at 5:53 AM
    #710
    Saltyhero13

    Saltyhero13 Throbbing Member

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    It changes shift points and holds gears longer.
     
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  21. Jun 11, 2021 at 6:09 AM
    #711
    Mad Max

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    tow haul mode changes throttle input. For example instead of a 1:1 ratio of pedal to throttle plate it 1;5 for example. It is a substantial difference in acceleration. I wouldnt turn it on at a light you may hit the person in front of you when you go.... it will lurch.
     
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  22. Jun 11, 2021 at 6:39 AM
    #712
    BrakeDust

    BrakeDust New Member

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    That's why I bought the cooler. I just run in plain old "D" even when towing. Truck seems to handle it just fine. Downhills and freeway off-ramps are the only times I run in S and then I manually "downshift" to get some engine braking.
     
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  23. Jun 11, 2021 at 8:07 AM
    #713
    Ruggybuggy

    Ruggybuggy New Member

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    Where did you find that information?
     
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  24. Jun 11, 2021 at 9:04 AM
    #714
    SSPey

    SSPey .

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    This makes sense in context, I can see D working for highway towing. For me, towing is mostly backroads with steep hills and curves and speed changes (20-60 mph), constant shifting - for this, the slightly higher rpms of S mode helps maintain towing power. Max torque on the 5.7L is at 3600 rpm, but even 2000 vs 2400 rpm delivers a noticeable difference in torque.
     
  25. Jun 11, 2021 at 10:28 AM
    #715
    eagleguy

    eagleguy New Member

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    Thanks! That's what I thought it did. Just used it after buying a new boat and there is a "real" difference for the better when driving.
     
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  26. Jun 11, 2021 at 10:57 AM
    #716
    Mad Max

    Mad Max New Member

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    push it while you are applying throttle without moving the gas pedal. You will accelerate but not downshift. Only thing which changes is throttle input vs gas pedal. Very similar to Pedal commander.
     
  27. Jun 11, 2021 at 8:02 PM
    #717
    Ruggybuggy

    Ruggybuggy New Member

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    Yes but that result can be from many inputs such as ignition timing and fuel mapping. Throttle data is probably a very small equation when tow haul is applied. I've never seen any info from Toyota on what actuators are manipulated when tow haul is activated.
     
  28. Jun 11, 2021 at 8:04 PM
    #718
    Mad Max

    Mad Max New Member

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    Don't kid yourself Toyota isn't that sophisticated. Its identical to Pedal commander (except doesn't hold transmission gears). It just changes ratio of accelerator pedal input to throttle response. Pedal commander openly explains how it works except they have multiple ratios (24?)
     
  29. Jun 11, 2021 at 8:17 PM
    #719
    Ruggybuggy

    Ruggybuggy New Member

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    ...but how do you now that? I just retired as a Toyota dealer tech and I've never seen any info on what parameters are change when tow haul is activated.
     
  30. Jun 11, 2021 at 9:24 PM
    #720
    sd172

    sd172 New Member

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    The Sequoia install is done and looks almost OEM. Will need some time to collect trans temperatures under different driving conditions, but so far it is consistently lower than before.

    F907C5BF-2C3F-46E5-AB13-BE3A085FA738.jpg D9FAE363-6318-424E-B307-B359F5409E88.jpg
     
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