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First transmission drain and fill finally

Discussion in '2.5 Gen Tundras (2014-2021)' started by SoTexTundra, May 18, 2025 at 6:05 PM.

  1. May 18, 2025 at 6:05 PM
    #1
    SoTexTundra

    SoTexTundra [OP] New Member

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    So I finally did my first drain and fill this evening due to having the @Genuine Cooling Systems installed and a transmission flush done a few weeks ago. The shop that did the install used non Toyota WS fluid and the truck felt weird so I decided to do a drain and fill with proper fluids. I drained out 3 quarts put 5 quarts in and when I did the check fluid at the right temp a quart came out after a trickle. Will check back if any issues come up over the next few days.
     
  2. May 19, 2025 at 4:21 AM
    #2
    agrestic1

    agrestic1 New Member

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    Sounds about right. Draining out 3 quarts sounds a bit low, but you are on the right track around 4 quarts.
     
    14crwmaxltd likes this.
  3. May 19, 2025 at 4:33 AM
    #3
    MadMaxCanon

    MadMaxCanon New Member

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    Too many, but not enough....
    Do you know what they used?
     
  4. May 19, 2025 at 5:54 AM
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    SoTexTundra

    SoTexTundra [OP] New Member

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    I do not just that it was better supposedly than WS fluid
     
  5. May 19, 2025 at 4:27 PM
    #5
    14crwmaxltd

    14crwmaxltd New Member

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    I dropped 8 quarts.

    Did he pin the trans cooler valve ?
     
  6. May 19, 2025 at 4:29 PM
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    14crwmaxltd

    14crwmaxltd New Member

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    Do you have the trans cooler, and did you pin it open ?

    I just did my trans, and it drained 8 quarts. I followed the guide which tells you to pin the valve, overfill, get to temp of 119*, then pop the overflow plug.

    0320251922.jpg
     
  7. May 19, 2025 at 4:36 PM
    #7
    Red&03Taco

    Red&03Taco YUT

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    None of that sounds quite right aside from pinning the thermostat. And I reckon your transmission might be severely underfilled right now.

    Proper procedure is:
    1. Drain the pan (measure what comes out, its typically about 4 quarts).
    2. Replace drain plug.
    3. Fill trans with 0.5 qt more than what drained out.
    4. Warm up truck until trans temps reaches 99-111°F.
    5. Crack the check valve and drain excess fluid until flow decreases to a trickle.
    6. Replace check valve plug.

    *Note some will just fill trans with exactly volume they drained and then skip the temp check procedure entirely, and that's probably fine too.
     
  8. May 19, 2025 at 4:48 PM
    #8
    SoTexTundra

    SoTexTundra [OP] New Member

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    Yea I have the genuine cooling system on my truck so I did pin it and only 3 quarts drained out.
     
  9. May 19, 2025 at 4:48 PM
    #9
    William jinks

    William jinks New Member

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    I'm curious, how many miles on your unit? Changing the fluid ?
     
  10. May 19, 2025 at 4:50 PM
    #10
    SoTexTundra

    SoTexTundra [OP] New Member

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    I have a bit over 61000 miles but after the cooler install the shop did a flush and used non Toyota ws fluid and the truck didn’t feel right
     
  11. May 19, 2025 at 9:29 PM
    #11
    14crwmaxltd

    14crwmaxltd New Member

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    Hmm.

    Took out 8 qts, filled with 9 qts, warmed to temp, and removed the stove pipe level plug to trickle.

    Yeah, i did it totally wrong, twice.

    Whatever you say, homey
     
  12. May 20, 2025 at 4:19 AM
    #12
    Shanet421

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  13. May 20, 2025 at 6:08 AM
    #13
    JLS in WA

    JLS in WA New Member

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    I’ve been using Valvoline Maxlife ATF for over 100k miles. No issues, shifts fine, tow a decent amount each year with it.
     
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  14. May 20, 2025 at 8:40 AM
    #14
    SoTexTundra

    SoTexTundra [OP] New Member

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    I believe the fluid was fine that they put it in but it seemed to be low to me when i drained it
     

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