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Transmission Cooler Bracket Kit - Hayden 679 / 689

Discussion in '2.5 Gen Tundra Parts Marketplace (2014-2021)' started by Jmunk, Jan 12, 2025.

  1. Apr 21, 2025 at 4:22 AM
    #61
    Jmunk

    Jmunk [OP] New Member

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    It looks like the 679/689 are the same in size as the 699 with the exception being the height and length are switched.

    When adding a cooler to the 2019 - 2021 years, you add the OEM thermostat. The thermostat gives you the temperature regulation as well as the inlet/outlet barbs.

    The Hayden 699 has a built in thermostat essentially. This would be redundant in addition to the OEM unit that gets installed.

    The Hayden 699 is rated the exact same as the 679 and 689 for towing capacity (10,000lbs) and GVWR (22,000lbd). I’m always open to thoughts and improvements, but I see no difference expect the extra thermostat in the 699.

    IMG_3470.jpg
    IMG_3469.jpg
     
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  2. Apr 26, 2025 at 5:17 PM
    #62
    Jmunk

    Jmunk [OP] New Member

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    Initial post updated with a new bracket for the 2011 - 2018 Tundra and 2011 - 2022 Sequoia with 5.7L.
     
    Last edited: Jun 20, 2025
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  3. May 15, 2025 at 5:42 AM
    #63
    JohnWhicker

    JohnWhicker New Member

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    Hey @Jmunk will this work with the Magnuson 2650 supercharger I have on my 2021? Not sure how is all going to fit in the front? I am interested in this kit for sure.
     
  4. May 15, 2025 at 6:25 AM
    #64
    Jmunk

    Jmunk [OP] New Member

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    I haven’t tried one so I can’t say for sure. If you have a photo of your truck with front grill off I should be able to verify fitment from that.
     
  5. Jun 3, 2025 at 3:55 AM
    #65
    MBhunter

    MBhunter New Member

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    Pm sent
     
  6. Jun 3, 2025 at 5:17 AM
    #66
    MBhunter

    MBhunter New Member

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    Any of you fellas run the 3/8 rubber hose all the way and not use hard lines in the middle? I was gone wrap them in a protective cover that they use on heavy equipment hydraulic lines. What you all think
     
  7. Jun 6, 2025 at 4:40 PM
    #67
    Jmunk

    Jmunk [OP] New Member

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    I have (1) discounted bracket kit left for the 2019 - 2021 Tundra for a Hayden 679 cooler only. This is the last of the first design before they became multi-fit for both the Hayden 679 and 689. Discounted to $80 shipped (powder coated bracket and hardware kit) - these fit the Hayden 679 only. If interested send me a PM. SOLD

    Also, I just picked up another batch of the 2019 - 2021 Tundra brackets for the Hayden 679/689 cooler from the powder coater. Feedback has been great on the kits sold.
     
    Last edited: Jun 20, 2025
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  8. Jun 7, 2025 at 7:15 AM
    #68
    shawn474

    shawn474 Lego connoisseur

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    I got the bracket yesterday; the Hayden 689 should be arriving tomorrow. Hoping to get it installed by next weekend. Will stop by the dealership to buy the fluid this week. Seems like a sturdy well made potency!??
     
  9. Jun 7, 2025 at 7:31 AM
    #69
    Jmunk

    Jmunk [OP] New Member

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    Glad it made it safe. Share some pictures once you get it installed!
     
  10. Jun 7, 2025 at 8:55 AM
    #70
    shawn474

    shawn474 Lego connoisseur

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    will do; waiting for parts from my Fred Anderson order too.
     
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  11. Jun 10, 2025 at 7:18 AM
    #71
    Tman2

    Tman2 New Member

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  12. Jun 15, 2025 at 3:44 PM
    #72
    Jmunk

    Jmunk [OP] New Member

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    After more and more installs I prefer a 90 fitting on the top and bottom port. This photo shows my preferred grommet placement in the wind deflector.

    IMG_3549.jpg
     
  13. Jun 28, 2025 at 10:41 PM
    #73
    Stockplayer

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    Installed the 2016 Sequoia cooler today. Everything went great.
     
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  14. Jun 29, 2025 at 4:13 AM
    #74
    Jmunk

    Jmunk [OP] New Member

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    Looks beautiful!
     
  15. Jun 29, 2025 at 10:49 AM
    #75
    Stockplayer

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    After reviewing multiple sources regarding transmission fluid flow and routing, I decided on the following configuration: the top (outlet) port of the thermostat is routed to the bottom (inlet) port of the cooler, and the top (outlet) port of the cooler is routed back to the bottom (inlet) port of the thermostat.

    This particular transmission had not been serviced for the first 120,000 miles of its life. Given this, I was cautious about replacing a large volume of fluid all at once. I chose to drain approximately 2 quarts and refill with 3.5 quarts. After following the proper procedure to verifying fluid level, about half a quart drained out.

    My plan moving forward is to replace 2 quarts during each oil change over the next few intervals. I’m hoping this gradual approach will mitigate the risk of transmission issues stemming from the previously infrequent maintenance.

    We'll be driving through the hot desert next week, so I’ll report back with updated transmission temperatures now that the cooler is installed.

    Thanks to everyone for the solid advice.

    – Erik
     
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  16. Jun 29, 2025 at 11:49 AM
    #76
    Silver17

    Silver17 Used, but returned and sold as new member

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    I was just looking at if I could make one of these work on my 2017 with a Harrop supercharger and front mounted intercooler. Looks like it will have to share the bottom left mount point with the intercooler pump mount, but that should not be a real problem. The bigger issue looks like the cooler would be in the same general location as the intercooler pump and hose where it comes out of the intercooler and into the suction. I could see it being mounted more easily biased to the drivers side if it was reversible and I could drill new mounting holes on the lower radiator support. Maybe it would hit the AC liquid line on that side however.

    What kind of temps does everyone see with these with a pinned open thermostat and/or plumbed in series with the factory cooler that is part of the AC condenser? I’m curious what the btu capacity of this Hayden cooler is vs the factory one. Is it capable of more cooling?

    IMG_2376.jpg
    IMG_2378.jpg
    IMG_2380.jpg
     
  17. Jun 29, 2025 at 11:52 AM
    #77
    Stockplayer

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    Silver17, you already have a cooler. You should be GTG. ‘19+ owners have no cooler at all.
     
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  18. Jun 29, 2025 at 11:58 AM
    #78
    Silver17

    Silver17 Used, but returned and sold as new member

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    I do have one yes, but I tow a 7k+ camper around in hilly terrain. I have my thermostat pinned open at all times and if I’m hitting a lot of longer hills and my TC is unlocked I still see it climbing over 200 in my pan sometimes. I’m looking for more cooling capacity to keep it around 180 max. I prefer it to be as cool as possible in all scenarios, personally.
     
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  19. Jun 29, 2025 at 12:09 PM
    #79
    Mdl

    Mdl Hey there...

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    Are you averse at removing the passenger wind wing or modifying it? Opens up a lot of cooling options and routing. I've had both removed since 2012 and never noticed any changes.
     
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  20. Jun 29, 2025 at 12:11 PM
    #80
    Mdl

    Mdl Hey there...

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    A few have over on the DIY $300 transmission cooler thread. Wrapping g with heat shield or using braided hose works.
     
  21. Jun 29, 2025 at 12:22 PM
    #81
    Stockplayer

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    Pre Hayden cooler I saw temps approaching 215 during casual Southern California driving. It seems like our ‘16 Sequoia runs cooler than my ‘19 Tundra. My Tundra could get up over 220 easy. I never checked tranny temps when air temps were above 85 but next week we will be in Palm Desert with 110+ temps. I’ll report back max temps in Sequoia.
     
  22. Jun 29, 2025 at 12:28 PM
    #82
    Silver17

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    Not if it doesn’t have any other adverse effects, wouldn’t bother me! Thanks for the suggestion. Gonna check out Snivs trans cooler thread more closely too. If not for the intercooler interference I like this bracket/cooler setup.
     
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