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Thread: 2014 and newer GM trans issues

  1. #1
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    Default 2014 and newer GM trans issues

    So in 2014 GM decided to put a in line trans cooler thermostat. The thermostat doesn’t open until trans fluid reach 180 degrees F. Your average person doesn’t scroll through the cluster to monitor the trans fluid temps. Sooooo if this thermostat sticks closed the trans fluid never circulates through transmission to cool it. The theory is make trans get warmer quicker which will warm engine quicker and meet emissions faster. If this thermostat sticks closed, you eventually burn up the transmission.

    So for “routine” maintenance we’ll replace thermostat for 325.00 or for 275.00 I’ll bypass the thermostat.

    2017 with 63k miles. Taken to dealer and GM offered no assistance. Powertrain warranty ran out at 60k



    Trans cooler thermostat



    Failed part.... stuck closed



    New tranny... roughly 5000.00 job

    More fuel = more boost!!

  2. #2
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    Default

    Why the hell didn’t you offer me this 2 weeks ago?

  3. #3
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    Bypassed, trans fluid will run from cooler to transmission as soon as vehicle is started... like normal vehicles with trans coolers. No thermostat that opens at 180 degrees.
    Last edited by KRT; 03-09-2020 at 07:57 PM.
    More fuel = more boost!!

  4. #4
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    Quote Originally Posted by Whackumstackum View Post
    Why the hell didn’t you offer me this 2 weeks ago?
    I learn everyday. Sometimes at my expense, sometimes at my customers.
    More fuel = more boost!!

  5. #5
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    Default

    All GM truck transmission?

  6. #6
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    Quote Originally Posted by Steelin' Ducks View Post
    All GM truck transmission?
    14 and newer. 2500 gassers don’t have it.
    More fuel = more boost!!

  7. #7
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    Suburbans and Tahoes?

  8. #8
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    Yes.
    More fuel = more boost!!

  9. #9
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    6-speed, 8-speed or 10-speed. You said all so maybe I just don't get it.
    Gettin old is for pussies! AND MY NEW TRUE people say like Capt. Tom >>>>>>>>>/
    "Wow, often imitated but never duplicated. No one can do it like the master. My hat is off to you DRDUCK!"

  10. #10
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    2014-2018 are all 6 speed or 8 speed in 2018 as an option

    This one is a 6L80E (6 speed)
    More fuel = more boost!!

  11. #11
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    Fuck gm , you know why I’m saying that and I was gmc truck guy , not anymore
    "I am a man, not an animal and I always try to conduct myself accordingly. Doing anything less is just giving up and expecting (and being okay) with failure."
    Rubberhead

  12. #12
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    Quote Originally Posted by Stumpknocker View Post
    Fuck gm , you know why I’m saying that and I was gmc truck guy , not anymore
    O7-18 is tough years. Between AFM and transmissions.
    More fuel = more boost!!

  13. #13
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    I was a Chevy guy since I was 14yo. Bought a new F-250 last week. GM can eat s**t and this is just one more reason why.

    Still love my C-10 though....

  14. #14
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    6.7 or 7.3?
    More fuel = more boost!!

  15. #15
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    I saw a 19 with 15k miles that had the trans go out last week. I’ve put 23k miles on my 18 and still hate the way it shifts but love everything else about the truck. I swear my 4l60e with 340k miles shifts smoother and is more predictable.

  16. #16
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    If so owned one, it would be bypassed. That being said my wife’s will be in the shop soon....
    More fuel = more boost!!

  17. #17
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    And the auto-stop is a PIA ! When you can do DOD delete, bypass the AS, and bypass the transmission thermostat I’ll be making an appointment.
    “The price of freedom is eternal vigilance” - Thomas Jefferson

  18. #18
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    Quote Originally Posted by KRT View Post
    6.7 or 7.3?
    6.2

  19. #19
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    Quote Originally Posted by Palmetto Pride View Post
    And the auto-stop is a PIA ! When you can do DOD delete, bypass the AS, and bypass the transmission thermostat I’ll be making an appointment.
    Come on
    More fuel = more boost!!

  20. #20
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    Quote Originally Posted by CurLee View Post
    6.2
    Sweet. 6 speed.

    What year?
    More fuel = more boost!!

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