1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Trans overheated!

Discussion in 'Towing' started by NCjaybird, Apr 23, 2016.

  1. Apr 4, 2017 at 1:24 PM
    #61
    shr133

    shr133 Well-Known Member

    Joined:
    Jul 8, 2013
    Member:
    #107900
    Messages:
    2,217
    Gender:
    Male
    First Name:
    Steve
    Muskego, WI
    Vehicle:
    2010 V6 Sport
    K & N filter, 275 70 17 Cooper AT3, OME Nitrocharger shocks, 884 Springs, Dakar leafs.
    The radiator(185) adds heat to the trans fluid to heat it up faster for better MPG so I by passed it.

    I have the obdlink lx and dash command app.
    I may need to add another app with trans temps.
    But I know it runs way cooler than stock and my fluid looks like new after a few years but it would be nice to monitor the temps.

    Do you know an app that has trans temps? It would help checking fluid levels also.
     
  2. Apr 4, 2017 at 1:30 PM
    #62
    07 sport 4x4

    07 sport 4x4 Well-Known Member

    Joined:
    Dec 24, 2010
    Member:
    #48165
    Messages:
    1,445
    Gender:
    Male
    First Name:
    Blake
    Southeast
    Vehicle:
    2017 Duramax
    I haven't used it, but other people are using the torque app I think. The trans cooler is in the bottom of the radiator, remember heat rises, the bottom of the radiator isn't 185°, I actually think my tranny would warm up faster without the radiator in the loop. Do me a favor and IR the lower radiator hose sometime and tell me what the temp is. My transmission runs too cool most of the time, I have a short drive to work and most of the time I can't get the transmission over 100°. On the highway in the summer I see between 130° and 150° Toyota says normal operating temp for the a750 is 122°-175°.
     
  3. Apr 4, 2017 at 1:41 PM
    #63
    shr133

    shr133 Well-Known Member

    Joined:
    Jul 8, 2013
    Member:
    #107900
    Messages:
    2,217
    Gender:
    Male
    First Name:
    Steve
    Muskego, WI
    Vehicle:
    2010 V6 Sport
    K & N filter, 275 70 17 Cooper AT3, OME Nitrocharger shocks, 884 Springs, Dakar leafs.
    Could be, I'll check it out. Both lines on mine are on the side of the radiator.
    I know my FRS has a heat exchanger That heats and cools the fluid. I plan on disconnecting the coolant lines and adding a bigger cooler.
     
  4. Apr 4, 2017 at 1:51 PM
    #64
    07 sport 4x4

    07 sport 4x4 Well-Known Member

    Joined:
    Dec 24, 2010
    Member:
    #48165
    Messages:
    1,445
    Gender:
    Male
    First Name:
    Blake
    Southeast
    Vehicle:
    2017 Duramax
    The tundra and third gen tacos have a heat exchanger and thermostat that heats the tranny fluid to the same temp as the engine coolant, 185-190°. Some people are reporting seeing temps around 220° towing. The radiator doesn't add any heat to the transmission unless you are moving too slow to cool the antifreeze before it reaches the bottom/ cold side of the radiator.
    Its on the cold side of the radiator though. I actually thought about adding a thermostat to my truck to warm the fluid up and keep from over cooling the fluid in the winter, then I might add a bigger cooler and delete the radiator cooler to avoid the pink milkshake possibility. I emailed Valvoline and asked them what they thought about a 180° thermostat. They said that 180° is a perfectly acceptable temperature, but higher temperatures deplete the additive package and break down the fluid faster.
     
  5. Apr 4, 2017 at 10:52 PM
    #65
    shr133

    shr133 Well-Known Member

    Joined:
    Jul 8, 2013
    Member:
    #107900
    Messages:
    2,217
    Gender:
    Male
    First Name:
    Steve
    Muskego, WI
    Vehicle:
    2010 V6 Sport
    K & N filter, 275 70 17 Cooper AT3, OME Nitrocharger shocks, 884 Springs, Dakar leafs.
    Did another ck.
    Passenger side radiator and cap 155.
    Drivers side 85.. way cooler.
    Trans cooler 100, after a few min down to 80... Cools off really fast.

    So the trans side does run much cooler , so it may not generate heat on the Tacoma. With the trans hooked up it would be hotter but not as hot as the engine side..
    But I'm not running through the radiator, I also want to avoid the pink milkshake.
    I thought about adding a thermostat but it runs fine, would just add parts and the fluid looks the best it every has and I when I'm off roading I push it. Burnt up the stock fluid in 7K, one day at the dunes pushed too long, it would get crazy hot.
    I used to just run the stock cooler in winter But this year I just ran both and it drives the same.

    I don't think you ever want the fluid over 170 if you can help it, so if I had a thermostat I would get around 130 but why would I want to build extra heat in the trans if it runs good. that would be like heating up the oil, you wouldn't.
    And the trans pulls harder when it's cool, you can tell when it heats up, you loose a lot of power.
    I don't think my set up runs too cool so I'm just going to leave it for now.
    But if I towed a lot I may get a larger cooler.
     
    07 sport 4x4 likes this.
  6. Apr 4, 2017 at 11:35 PM
    #66
    07 sport 4x4

    07 sport 4x4 Well-Known Member

    Joined:
    Dec 24, 2010
    Member:
    #48165
    Messages:
    1,445
    Gender:
    Male
    First Name:
    Blake
    Southeast
    Vehicle:
    2017 Duramax
    The thermostats I was looking at start to open around 160° and fully open at 180°. I would like constant temps to promote less wear and to get the transmission hot enough to control any moisture that might accumulate. Constant temps help to minimize wear because parts expand and contract as they heat and cool. The majority of engine wear occurs at startup because the parts haven't expanded to their normal operating size. It's not as important in a transmission obviously, but the principle still applies. I agree that these transmissions do shift firmer when they are cold, but mine is often slower to downshift when it's cooler, it feels more responsive when it gets around 150° and up. If I could pick a temperature that I preferred to run at all the time, it would be 150°-160°. The truck adjusts the shift points and pressures using the temp sensors in the pan. All that said, after 10 years my truck is still shifting and operating fine with a mostly stock atf cooling configuration. The only thing I've changed is routing a remote filter mount and spin on filter after the radiator, but before the aux cooler. I'm gonna change my spin on filter soon and cut it open to see what all it has caught in the last 20k miles. I have a really strong neodymium magnet on the outside of the filter, so I'm excited to see if it has pulled any ferrous particles out of suspension in the fluid. I'm probably over thinking and over complicating this, but I enjoy it, so...
     
  7. Nov 17, 2018 at 7:57 PM
    #67
    Rico's Taco '11

    Rico's Taco '11 Well-Known Member

    Joined:
    Oct 7, 2015
    Member:
    #166079
    Messages:
    55
    Gender:
    Male
    Vehicle:
    2011 Toyota Tacoma Double-Cab
    Class 3 Hitch and Trailer wiring harness
    I would have used "D" for down hills and "4" for driving. This would keep the engine from revving up/heating up. Transmission cooler might be to small to keep temperature down. Also, you can route the transmission fluid two different ways.
     
  8. Jul 9, 2020 at 9:49 AM
    #68
    12TRDTacoma

    12TRDTacoma Powered by Ford, GM, VW, and Mercedes

    Joined:
    Aug 20, 2012
    Member:
    #85133
    Messages:
    14,393
    Gender:
    Male
    First Name:
    Rob
    Concordia
    Vehicle:
    12 TRD Sport DCLB 4x4 Supercharged
    Boosted
    What is your trans cooler part number?

    I would be interested in getting rid of the OE cooler and swapping it out with your exact setup.
     
  9. Jul 9, 2020 at 7:39 PM
    #69
    Thirsty1

    Thirsty1 New Member

    Joined:
    Jun 2, 2020
    Member:
    #330228
    Messages:
    4
    Gender:
    Male
    Last edited: Jul 9, 2020
    m00seNUckLEz likes this.
  10. Jul 12, 2020 at 7:12 PM
    #70
    ROAD DOG

    ROAD DOG Well-Known Member

    Joined:
    Nov 4, 2019
    Member:
    #309830
    Messages:
    1,250
    Gender:
    Male
    Vehicle:
    2019 I4 WHITE SR PRERUNNER
    FEW

    iv read this a couple dozen times

    i dont ever doubt a svc mgr at a dealer will blow smoke up Ur butt ...........

    at the same time i truly Dont Understand how 80% downhill
    will overheat ANY transmission

    MOST will disengage.........coast or at least ' traling throttle '
    all 3 most definitely wont put a strain on a trans

    no less 80% downhill would provide a respite if the 20% straight or intermittent
    were a hard pull

    if it did overheat
    blew out fluid in the amount U observed

    how much fluid was replaced ?!?!?!?
     
  11. Aug 12, 2020 at 12:24 AM
    #71
    m00seNUckLEz

    m00seNUckLEz tAc0 aFiCi0nAd0

    Joined:
    Dec 20, 2015
    Member:
    #172698
    Messages:
    702
    Gender:
    Male
    First Name:
    Ryan
    Fresno, CA
    Under Construction
    Today I installed a B&M Supercooler and Derale external Trans filter. Install went kinda smoothly. Completed a trans drain and the fluid was pretty brown. I struggled to get the truck into TEMP CHECK MODE. I think I'm going to do the same as you guys and monitor trans temps with my app to make sure I'm in the 115-130 degree range.

    [​IMG][​IMG]

    One question though, I don't have a ScanGuage or UltraGuage, I'm using the OBD Fusion app through my iPhone and it shows two different trans temps. When driving they are off from each other about 10 degrees. Which one do you guys suppose measures pan temp? When driving uphill I see that A/T OIL TEMP 2 is always higher than A/T OIL TEMP 1.

    [​IMG]

    I modified both gauges to highlight when both are in the Green (115-130 Degrees)
     
  12. Aug 12, 2020 at 12:28 AM
    #72
    07 sport 4x4

    07 sport 4x4 Well-Known Member

    Joined:
    Dec 24, 2010
    Member:
    #48165
    Messages:
    1,445
    Gender:
    Male
    First Name:
    Blake
    Southeast
    Vehicle:
    2017 Duramax
    The lower of the two (and most stable) will be the pan temp. My 2007 Tacoma used to check at 97-115°F in temp check mode. I once put the truck into temp check mode with the jumper wire and then unplugged the jumper wire and then reinstalled and verified the check temp range with my Ultragauge.
    As you can see, the temp light is not on at 95°, then comes on solid at 97° and remains solid until the temp reaches 115° at which point the temp light starts flashing to indicate that the temperature is out of range (too high).
    8372F48D-D2FC-4021-AD6A-B7F52151B723.jpgBA0CBA74-D0C8-4C19-A228-39E7CF4804C4.jpgF7CF6789-1D66-478D-A800-9908F77821FE.jpg9C8A3FD5-4D62-4560-9CC1-8D96DAE965AD.jpg
     
    Last edited: Aug 12, 2020
    m00seNUckLEz likes this.
  13. Aug 12, 2020 at 1:15 AM
    #73
    m00seNUckLEz

    m00seNUckLEz tAc0 aFiCi0nAd0

    Joined:
    Dec 20, 2015
    Member:
    #172698
    Messages:
    702
    Gender:
    Male
    First Name:
    Ryan
    Fresno, CA
    Under Construction
    OK, awesome. I'll change that bottom one to say A/T PAN TEMP. Thanks for that, that's exactly what I was wanting to know.
     
    07 sport 4x4 likes this.
  14. Aug 12, 2020 at 1:25 AM
    #74
    07 sport 4x4

    07 sport 4x4 Well-Known Member

    Joined:
    Dec 24, 2010
    Member:
    #48165
    Messages:
    1,445
    Gender:
    Male
    First Name:
    Blake
    Southeast
    Vehicle:
    2017 Duramax
    When I said “lower” I meant temperature, I was not referring to your picture. AT temp 1 in your case would be the pan temperature and AT temp 2 would be the Torque Converter fluid temperature. Sorry for the confusion.
     
    m00seNUckLEz likes this.
  15. Aug 12, 2020 at 1:29 AM
    #75
    m00seNUckLEz

    m00seNUckLEz tAc0 aFiCi0nAd0

    Joined:
    Dec 20, 2015
    Member:
    #172698
    Messages:
    702
    Gender:
    Male
    First Name:
    Ryan
    Fresno, CA
    Under Construction
    Ah, ok. Thank you for clearing that up for me. Will Change those now. Thanks, man :cheers:
     
    07 sport 4x4 likes this.
  16. Aug 12, 2020 at 1:37 AM
    #76
    m00seNUckLEz

    m00seNUckLEz tAc0 aFiCi0nAd0

    Joined:
    Dec 20, 2015
    Member:
    #172698
    Messages:
    702
    Gender:
    Male
    First Name:
    Ryan
    Fresno, CA
    Under Construction
    There, fixed it so I now I know exactly what I'm looking at.

    IMG_9485.jpg
     
    07 sport 4x4 likes this.
To Top