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2.7 OEM transmission cooler

Discussion in '4 Cylinder' started by Bigjoe7757, May 20, 2016.

  1. May 20, 2016 at 11:07 AM
    #1
    Bigjoe7757

    Bigjoe7757 [OP] Well-Known Member

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    hello all, I'm just wondering if anyone has ever added the OEM transmission cooler to their 2.7 auto. I'm considering adding one and wanted to see if there are any issues thanks
     
  2. May 21, 2016 at 6:34 AM
    #2
    2.7taco

    2.7taco Well-Known Member

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    Fat Bobs 2.75 lift and level with short AAL, 16x8 Level 8 Guardian Wheels, 245/75R16 Toyo Open Country ATII, custom trans shift kit(home made), Trans temp. and Vac gauge, URD fuel pump upgrade(going back to stock soon).
    The oil cooler is actually 2 part on my 5 lug. One line enters the radiator and the other exits and makes a few s-bends before dumping back in to the transmission. Honestly the type T-IV ATF is good for a much higher transmission temp than most people ever see. If you make 240 degrees I'd begin to worry. I monitor the line temp after the torque converter and before the radiator. Highest I have ever seen is 225 with a bed beyond full of logs. Had no more suspension travel and pulling some hills in 1st. :D
     
  3. May 22, 2016 at 7:09 AM
    #3
    Bigjoe7757

    Bigjoe7757 [OP] Well-Known Member

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    Thanks for the info, I don't really tow or anything. I have just always had coolers on my trucks, always drove ford. With your info I feel better just leaving it stock.
     
  4. May 23, 2016 at 5:34 PM
    #4
    03maurderman

    03maurderman Well-Known Member

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    Not sure I want to leave it to chance regarding the lack of a trans cooler...Not disputing 2.7 taco....I'll be doing some southwestern desert driving & don't want to have a non cooler regret....I would like to install an OEM cooler, but not sure if I have to change the lines...I don't know of a 2.7 with a trailer pgk. and don't want to hack the cooler lines, would like it be a factory appearance.... Would like advise if anyone installed one.....Thanks
     
  5. May 23, 2016 at 6:47 PM
    #5
    crewdog92

    crewdog92 Active Member

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    I'm looking for someone to "Blaze the Trail" on a 16 Taco 2.7 Trans Cooler too ;-) ........ and give us the straight skinny and ungarbled Word!!
     
  6. May 23, 2016 at 6:51 PM
    #6
    03maurderman

    03maurderman Well-Known Member

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  7. May 24, 2016 at 5:29 PM
    #7
    Bigjoe7757

    Bigjoe7757 [OP] Well-Known Member

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    I'm been doing the OEM parts research and its around $400 from what I can tell. Will update when I figure everything out.
     
  8. May 24, 2016 at 6:07 PM
    #8
    03maurderman

    03maurderman Well-Known Member

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    From what I have been reading, sounds like the OEM does not cut the mustard...Would rather go larger than smaller.....Thanks for your efforts...
     
  9. May 27, 2016 at 10:35 AM
    #9
    PreRunnerAlabama

    PreRunnerAlabama Well-Known Member

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    Looking at doing the same thing. I didn't want to pay for the tow package. I added my own Curt receiver and hitch and also looking for a transcooler. Don't really know if i want to go OEM or Aftermarket.
     
  10. May 27, 2016 at 6:56 PM
    #10
    2.7taco

    2.7taco Well-Known Member

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    Fat Bobs 2.75 lift and level with short AAL, 16x8 Level 8 Guardian Wheels, 245/75R16 Toyo Open Country ATII, custom trans shift kit(home made), Trans temp. and Vac gauge, URD fuel pump upgrade(going back to stock soon).
    The A340E will not lock the converter unless over 100-110 degrees. Now the question is how hot is too hot. Over 235 the temp will begin to skyrocket in comparison to just slow heating. Now the ATF passes through the section of the radiator cooling it to + 20or - 20 degrees depending on if your hot or cold. If your hot and running 225 at the converter to cooler line after the radiator you will drop Temps lower than engine operating temps. Remember there is a small loop of tubing (air cooled section). For the life of me I can't remember if it's before or after the radiator.:D
    Anyway too cool is a problem too as the viscosity plays into shift feel. I have shims under the 1/2 and 2/3 shift accumulators. I intentionally left overdrive(4th)/reverse accumulator alone as I did not want to induce added stress to the overdrive clutches.

    Now back on topic. Plate and fin coolers are small but very effective. If you really want to cool the ATF go up one line size. Example if the factory size is 3/8 then up size to 1/2 and slow the oil down and stay in the cooler a bit longer. If you are in cold climates the proper way to hook up an auxiliary cooler is transmission output to cooler, cooler to radiator, radiator to transmission. Yes, that effectively heats up the ATF to nearly the same as without an additional cooler. So now I'm sure your wondering why go through all the extra effort to cool the ATF only to heat it back up? The answer is simple the air cooler knocks the excessive ATF temp down and the radiator maintains the constant temp required for proper operation.

    Sorry for being long winded. I hope that sheds some light on the subject.
     
    3rYODA, Bigjoe7757 [OP] and jpneely like this.
  11. May 27, 2016 at 7:22 PM
    #11
    03maurderman

    03maurderman Well-Known Member

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    I have to admit this is a bit over my head...My thought was put a boot over the cooler in the winter & have it exposed in the summer...We also have a Ram 1500 that has a factory tow pgk & coolers for the A/T & P/S...Those coolers are exposed 12 months...Why would the Taco be any different than the Ram?
     
  12. May 27, 2016 at 7:24 PM
    #12
    Bigjoe7757

    Bigjoe7757 [OP] Well-Known Member

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    Thanks for the great answer
     
    2.7taco likes this.
  13. May 27, 2016 at 7:27 PM
    #13
    2.7taco

    2.7taco Well-Known Member

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    Fat Bobs 2.75 lift and level with short AAL, 16x8 Level 8 Guardian Wheels, 245/75R16 Toyo Open Country ATII, custom trans shift kit(home made), Trans temp. and Vac gauge, URD fuel pump upgrade(going back to stock soon).
    A completely valid question. The answer is a thermostat built into the cooler housing or a cooler sized just large enough to take the edge off. Most of the time they use a thermostatic rod that under heat expands and pushes the valve open which forces the oil through the cooler. When it's not hot enough it just returns to the pan.
     
  14. May 27, 2016 at 7:27 PM
    #14
    2.7taco

    2.7taco Well-Known Member

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    Any time.
     
  15. May 27, 2016 at 7:38 PM
    #15
    03maurderman

    03maurderman Well-Known Member

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    Learned something new...so really the smaller OEM one would be adequate? My concern is desert driving in the summer, along with the bed being somewhat loaded....
     
  16. May 27, 2016 at 7:41 PM
    #16
    2.7taco

    2.7taco Well-Known Member

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    Fat Bobs 2.75 lift and level with short AAL, 16x8 Level 8 Guardian Wheels, 245/75R16 Toyo Open Country ATII, custom trans shift kit(home made), Trans temp. and Vac gauge, URD fuel pump upgrade(going back to stock soon).
    The OEM would be more than sufficient. :thumbsup:

    Try running an ATF Temp gauge with an RTD in the transmission pan and you will be pleasantly surprised.
     
  17. May 27, 2016 at 7:46 PM
    #17
    2.7taco

    2.7taco Well-Known Member

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    Fat Bobs 2.75 lift and level with short AAL, 16x8 Level 8 Guardian Wheels, 245/75R16 Toyo Open Country ATII, custom trans shift kit(home made), Trans temp. and Vac gauge, URD fuel pump upgrade(going back to stock soon).
    Sorry RTD is an industry term. Transmission temp probe threaded into the pan.
     
  18. May 27, 2016 at 7:54 PM
    #18
    03maurderman

    03maurderman Well-Known Member

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  19. May 27, 2016 at 8:34 PM
    #19
    2.7taco

    2.7taco Well-Known Member

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    2005 Tan Tacoma Base 5 LUG: Beaten , abused and still running strong.
    Fat Bobs 2.75 lift and level with short AAL, 16x8 Level 8 Guardian Wheels, 245/75R16 Toyo Open Country ATII, custom trans shift kit(home made), Trans temp. and Vac gauge, URD fuel pump upgrade(going back to stock soon).
    It reads off of an internal sensor. Not 100% sure of its location within the valve body but normally it will be about 10 - 15 degrees different than pan temperature. Pan temperature will be cooler.

    What's the current running temp?
     
  20. May 28, 2016 at 6:34 AM
    #20
    03maurderman

    03maurderman Well-Known Member

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    Your talking to an ole skool guy...when every time you dropped a transmission pan it leaked ever since...I remember in the service a guy had a 64 Chevy SS with a power glide stationed in New Mexico. The transmission hup got so hot you could not keep your hand on it...as a result it developed a whine...Even a scan gauge is a challenge for me....
     

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