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Trans Cooler

This is a discussion on Trans Cooler within the Automatic Transmission forums, part of the Drivetrain category; Does anyone know? The trans fluid lines going into the radiator - which line is fluid out of the transmission, ...

  1. #1
    Member speedkills's Avatar
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    1999 Chev Z28 Camaro,

    Trans Cooler

    Does anyone know?

    The trans fluid lines going into the radiator - which line is fluid out of the transmission, the upper or lower line?

  2. #2
    Life in the Fast lane sunsetorangess's Avatar
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    Met. Sunset Orange
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    I would say the lower line.
    J
    2001 SS, Its not the car its the Driver that matters....

  3. #3
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    I would say the upper line, but the best way to find out is ask a mechanic, the other way is disconnect the lines and see which one the fluid pumps out of.

  4. #4
    Member performabuilt's Avatar
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    lower line is out on the 4l60e on the trans ,

  5. #5
    Mrs.'s Boobies
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    2001 Camaro SS

    Trans Lines:
    Lower = output
    Upper = input

    Cooler Lines:
    Lower = input
    Upper = output (this is to keep all debris in the cooler out of the trans, so fluid rises to the top while debris falls to the bottom)
    George P. Lara
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  6. #6
    Slower Than a 3rd Gen juiced99ws6's Avatar
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    Mystic Teal
    99 Trans Am & 01 CBR 929

    Quote Originally Posted by 12secSS View Post
    Trans Lines:
    Lower = output
    Upper = input

    Cooler Lines:
    Lower = input
    Upper = output (this is to keep all debris in the cooler out of the trans, so fluid rises to the top while debris falls to the bottom)
    good info

  7. #7
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    The line with the rubber hose section is the hot output side from the transmission. As you can see, it enters at the base of the radiator. I know it is the hot line because I made sure of it when I installed my trans temp gauge sensor.

  8. #8
    This Light Dinner Is Over hamburger68's Avatar
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    1998 Camaro Z28 A4

    Question

    Question:
    Do the 98 Z28s come with a stock trans cooler, or would that be a mod?
    'Cos then i'd be getting one asap!

  9. #9
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    Quote Originally Posted by hamburger68 View Post
    Question:
    Do the 98 Z28s come with a stock trans cooler, or would that be a mod?
    'Cos then i'd be getting one asap!
    All automatic transmission equipped vehicles has OEM transmission coolers. If you are using an aftermarket stall (looser then stock), you will need a bigger or supplementary cooler.

  10. #10
    This Light Dinner Is Over hamburger68's Avatar
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    So, longer freeway trips at higher speeds (100+ mph) are no problem with the OEM cooler? I know that here in Germany, a lot of Chrysler/Dodge transmissions have heat problems at higher speeds over longer distances and die prematurely.
    I have a 2.73 rear end, so the engine turns 2500 rpm at 150km/h (95 mph).

  11. #11
    Senior Member Orcus79's Avatar
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    an aux cooler is never a bad investment, cooler temps = longer life.

  12. #12
    This Light Dinner Is Over hamburger68's Avatar
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    that was my thought, too.

    By the way: Great avatar, just saw the movie (an hour ago).

  13. #13
    Slower Than a 3rd Gen juiced99ws6's Avatar
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    Mystic Teal
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    Quote Originally Posted by 01Z28M6 View Post
    Click for full size
    The line with the rubber hose section is the hot output side from the transmission. As you can see, it enters at the base of the radiator. I know it is the hot line because I made sure of it when I installed my trans temp gauge sensor.
    how hard and how much was your trans temp gauge

  14. #14
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    1998 Camaro Z28

    so wich tranny cooler would you recommend? isit hard t install?is it better to cap off the radiator coolerlines and get an independent cooling system for the tranny

  15. #15
    ORNGP33L 1BADDLS1's Avatar
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    Hugger Orange
    1999 Camaro Z-28

    B&M off of Thunder Racing works great 24,000 $70
    electric trans temp gauge, autometer $55

    both easy installs with following write ups

  16. #16
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    Yes, the B&M makes the stacked plate type cooler. These are supposed to be better than the finned tube style, or so I've been told. I could see right away the stacked plates are pretty much immune to smashed fins.

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