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How to Drain/Refill Automatic Transmission

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Fortech, Dec 5, 2009.

  1. Feb 19, 2015 at 7:59 PM
    #461
    bshort

    bshort Member

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    Well...went through the process, except I forgot to shift through ALL the gears. Did the whole n-d thing and buttoned her up at an OK trickle. Think I need to go through the gears (P-1) and re-check or.... ?
     
  2. Mar 5, 2015 at 11:25 AM
    #462
    Fiend13

    Fiend13 Well-Known Member

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    sub'd. Ready through the first post and few after that. I'm at work and don't have time to read through all of this but has anyone mentioned whether the 2wd prerunner V6 has the AT TEMP light or use the "D" light? If not, I'll just check when I'm off work and look for that light on my dash.
     
  3. Mar 11, 2015 at 6:51 AM
    #463
    KaPantsKey

    KaPantsKey Well-Known Member

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    Question: Does the Transmission have to be "cold" before you drain the fluid? And then you refill what came out (plus 1/3 quart), warm the fluid up, then check the level?
     
  4. Mar 11, 2015 at 7:08 AM
    #464
    gearcruncher

    gearcruncher Well-Known Member

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  5. Mar 11, 2015 at 8:20 AM
    #465
    KaPantsKey

    KaPantsKey Well-Known Member

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    Thank you, gearcruncher. So, I should:

    1. Drain (measure drainage), then add 1/3 quart more.
    2. Start engine to get trans to temp.
    3. Once it gets to temp, pull the overfill plug.
    4. Let it trickle if anything comes out. If nothing comes out, turn off truck and add more fluid. Repeat 2-4.

    What does running allow during the checking process? Just curious. Reason I ask is because the transmission fluid will continually get hotter effectively making the 115-130 degree mark invalid.
     
  6. Mar 11, 2015 at 8:35 AM
    #466
    1rooster

    1rooster TACOMA31750

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    If you turn the truck off, the transmission pump will also stop spinning. The pump is what puts the positive pressure in the fluid lines so the fluid will flow to the cooler and aux cooler.There for all the fluid will drain back into the pan, giving an incorrect reading. But as far as the tempature increasing while checking the fluid, it won't increase as fast as you think. It would take multiple minutes to increase from 115 to 130 degree. I takes me like 20 + min of ideling to reach the desired temp of 115.
     
  7. Mar 11, 2015 at 10:04 AM
    #467
    KaPantsKey

    KaPantsKey Well-Known Member

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    Makes sense. Thanks for the response!
     
  8. Mar 11, 2015 at 10:12 AM
    #468
    Lurkin

    Lurkin Well-Known Member

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    Put it in gear, hold the brake and rev to about 2k rpm, it will warm up quick :D
     
  9. Mar 11, 2015 at 10:22 AM
    #469
    1rooster

    1rooster TACOMA31750

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    Haha. Indeed it will! What also will work and don't put as much strain on the torque converter is applying the parking brake and putting it in drive. Warms up much quicker!
     
  10. Mar 13, 2015 at 5:21 AM
    #470
    KaPantsKey

    KaPantsKey Well-Known Member

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    So, I drained the transmission fluid last night. 3 quarts came out. So, I added approximately 3.3 quarts back in. Started the truck and let the transmission warm up. Pulled the check plug and about 1/2 a quart came out. That seems odd that 1/2 a quart came out versus 0.3 quarts. An insight on why more fluid came out that I overfilled? That now means my transmission has less fluid in it that when I started.
     
  11. Mar 13, 2015 at 5:59 AM
    #471
    Lester Lugnut

    Lester Lugnut Well-Known Member

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    Assuming everything was done according to plan, your transmission may have been slightly overfilled?

    Lots of talk on this forum about 2nd Gen Tacoma transmissions being under-filled. Humans fill these things and some times err in either direction.
     
  12. Mar 13, 2015 at 6:06 AM
    #472
    KaPantsKey

    KaPantsKey Well-Known Member

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    It appears to be shifting fine so I might just roll with it for awhile and see how it behaves. Ran the freeway to work this morning and it only ever got to 100 degrees, so that's good.
     
  13. Mar 19, 2015 at 4:18 PM
    #473
    Captain Wonker

    Captain Wonker New Member

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    Hey thanks for the post! Very helpful....only drained approximately 1.5 qts. Just got my '08 about 6 months ago and didn't start the 'lurch' until a month ago. Found a slight leak on one of the hard lines going to the cooler and hopefully patched that up. Hopefully when i get the level back to where it should be I will lose the Tacoma 'lurch'!
     
  14. Mar 23, 2015 at 5:16 PM
    #474
    nj636

    nj636 Hub Master General

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    planning on doing the fluid change in the next few weeks -- thank you for the write up :thumbsup:
     
  15. Mar 24, 2015 at 12:47 PM
    #475
    AlanLoshbaugh

    AlanLoshbaugh Well-Known Member

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    I don't know if anyone posted this before; I found it helpful.
    I'm curious about step 11 though, as that seems like one should take off the OBD jumper after activating temp test mode...

    10) Move the shift lever to the D position, and quickly move then back and forth between N and D
    (once per less than 1.5 seconds) for at least six seconds. This will activate the oil temperature detection mode. Standard: The ATF temp. warning light remains illuminated for 2 seconds and it goes off.
    11) Return the shift lever to the P position and disconnect the terminal TC.
    12) Idle the engine to raise the oil temperature. 13) Immediately after the ATF temp. warning light turns on, lift the vehicle up.
    D The ATF temp. warning light will indicate the ATF temperature according to the following table.

    (Insert table here)
    ATF Temp. Warning Light:
    Less than optimized temperature-Turn OFF
    Optimized temperature-Turn ON
    More than optimized temperature-Blinking
     

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    Last edited: Mar 24, 2015
  16. Mar 24, 2015 at 5:55 PM
    #476
    over60

    over60 Over70 & still a "Grumpy Old Guy"

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    Hope you had the truck very LEVEL during this process.... If not... might want to do again... on level ground...


    Just saying...


    Over
     
  17. Mar 25, 2015 at 5:02 AM
    #477
    KaPantsKey

    KaPantsKey Well-Known Member

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    It couldn't have had more than a 2-3 degree angle to it. I put a level on the frame prior to the service. Even then, the trucks have rake to them, so the only way to get it perfectly level would be to hoist it. In the grand scheme of things, do you think the 2/5ths of fluid would do damage? Surely, others have ran with drastically under filled transmission compared to mine.
     
  18. Mar 25, 2015 at 5:09 AM
    #478
    beachingtaco

    beachingtaco "We have assumed control"

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  19. Mar 31, 2015 at 10:30 AM
    #479
    Gearheadesw

    Gearheadesw Well-Known Member

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    This place is great. Can find almost anything. Had question on OBD jumping, and here it is.
     
  20. Mar 31, 2015 at 10:35 AM
    #480
    pavemobile

    pavemobile Well-Known Member

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    If you have an OBD 2 scanner that has real-time monitoring, you can watch your trans temp that way. That's what I did when I followed this procedure.
     

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