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1G Auto Trans heating up in all gears but 3rd

Posted by ShayneZ, Aug 17, 2019

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  1. ShayneZ

    ShayneZ Supporting VIP

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    Searching for help & advice on trying to determine and figger out why my new Metro rebuilt 1ga tranny, running JB Designs internals and precision converter, gets hot in 1,2 and 4th gears but will cool down quickly in 3rd, all just driving around normal like super low boost? Any help is greatly appreciated people. Thanks in advance!!!
     
  2. ThunderChild

    ThunderChild Supporting VIP

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    I'm not well versed for our autos, but I believe 3 is essentially direct drive as far as the gearing goes. Sounds like you have slipping clutches maybe, have you checked the fluid to make sure you don't have burnt or dark fluid? Maybe the pump pressure is too low, not providing enough clamp force to certain clutch packs under load?
     

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  3. ShayneZ

    ShayneZ Supporting VIP

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    Thing is, this new rebuilt tranny by a top auto trans company Metro.. it has like 10 miles on it. But those are things to check for sure. Thanks for the advice.
     
  4. ThunderChild

    ThunderChild Supporting VIP

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    Did they do the install? If so, take it back, let em know what's up so they can check it out for you.
    Regardless you should call and talk to them.

    Good shops make mistakes still, it happens.

    What's your cooler setup like? What fluid are you using? What type/brand is, and where is your temp sensor located?
     

    Street Build 247  3

    1990 Plymouth Laser N/T
    fwd · manual · 1G DSM

    346  8

    1987 Toyota Pickup/Hilux
    awd · manual · Misc Vehicles

    Street Build 890  7

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM

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    1992 Eagle Talon TSi AWD
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  5. ShayneZ

    ShayneZ Supporting VIP

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    Yep too bad it cost 400 bucks to ship. JD Hyguard tranny fluid, big ass cooler that must work pretty well, as you can watch the temps go down when in 3rd. Temp sensor right next to line output on tranny.
     
  6. ThunderChild

    ThunderChild Supporting VIP

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    That might be why your seeing temp spikes, usually I see people putting the sensors in the pans, since the output to the cooler is essentially right off the converter and it'll get big temp spikes under load.

    There was a recent thread about this, can't find it now. But be aware you'll see higher spikes on the trans-out line vs cooler-to-trans or pan (I recall reading as high as 300*). Pan temp going to the pump should be most important, as long as that keeps a stable temp in acceptable ranges you should be fine, long as your converter isn't burning fluid in the 450-600* range, but I'd expect a converter failure at that point.
     

    Street Build 247  3

    1990 Plymouth Laser N/T
    fwd · manual · 1G DSM

    346  8

    1987 Toyota Pickup/Hilux
    awd · manual · Misc Vehicles

    Street Build 890  7

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM

    Street Build 1K  1

    1992 Eagle Talon TSi AWD
    manual · 1G DSM

    Street Build 2K  10

    1992 Eagle Talon TSi AWD
    awd · manual · 1G DSM
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  7. ShayneZ

    ShayneZ Supporting VIP

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    Ahhhaa.. Maybe a false high reading from temp sensor being in wrong location? That was my initial thoughts. Will dig deeper. If you find that link send it away.

    Thanks again ThunderLips!!
     
  8. ThunderChild

    ThunderChild Supporting VIP

    2,540
    714
    Joined Jan 5, 2012
    Rathdrum, Idaho

    Street Build 247  3

    1990 Plymouth Laser N/T
    fwd · manual · 1G DSM

    346  8

    1987 Toyota Pickup/Hilux
    awd · manual · Misc Vehicles

    Street Build 890  7

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM

    Street Build 1K  1

    1992 Eagle Talon TSi AWD
    manual · 1G DSM

    Street Build 2K  10

    1992 Eagle Talon TSi AWD
    awd · manual · 1G DSM
    Loading...
  9. ShayneZ

    ShayneZ Supporting VIP

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    Joined Jun 27, 2018
    Lincoln, Nebraska
    Sweet, thanks again ThunderChild. Much appreciated for your help!!
     

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