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4L60E cooler lines

This is a discussion on 4L60E cooler lines within the Technical / Maintenance forums, part of the General Discussion category; I didnt mark which line went to which fitting when I pulled the tranny(no guarantee they would have bee right ...

  1. #1
    Registered User HUMP's Avatar
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    4L60E cooler lines


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    I didnt mark which line went to which fitting when I pulled the tranny(no guarantee they would have bee right anyway).Im thinking the top line out of the tranny goes to the lower line on the radiator?Any help is greatly appreciated,Im headed out to try and stab my new rebuild.

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    Re: 4L60E cooler lines

    I may be wrong on this, but i dont know that it really matters which line is connected where. It would be my understanding that either way u have a inlet and an outlet and the fluid is going to travel through the cooler regardless of which way it flows in out. but ive never messed with that on my truck so i cant say for sure.
    Last edited by 05crew; 04-15-2010 at 04:34 PM.


    2000 Silverado Z71 ecsb- XD spys/295-70-17 Cooper Discoverer STT/Debadged & Demolded/Muffler cut off Other than that shes still stock

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    Registered User knightrider955's Avatar
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    Re: 4L60E cooler lines

    Top line on your tranny is the return line, bottom one is the pressure line.
    97 GMC Yukon. True Duals, Hypertech, 99 Tranny. Punished religiously

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    Home of the Snooki punch! CKTA's Avatar
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    Re: 4L60E cooler lines

    I'm pretty sure the top line is the HOT line from the tranny, and the bottom is the return.........
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    Registered User knightrider955's Avatar
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    Re: 4L60E cooler lines

    Let me re-phrase. There are two connection ports on the tranny where you lines hook to. The top port is the return line, the bottom port is the pressure line. The bottom pressure port on the tranny should be hooked to the top port on your radiator. The bottom port on your radiator is the return and should be hooked to the top port on your tranny. Thats how it is. Even though its not really gonna matter either way.
    Last edited by knightrider955; 04-16-2010 at 05:58 AM.
    97 GMC Yukon. True Duals, Hypertech, 99 Tranny. Punished religiously

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    Old Man Mountain Swaggerwagon's Avatar
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    Re: 4L60E cooler lines

    top line return, bottom line in-feed from trans...

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    Re: 4L60E cooler lines

    I stand corrected.
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    Re: 4L60E cooler lines

    Quote Originally Posted by knightrider955 View Post
    Let me re-phrase. There are two connection ports on the tranny where you lines hook to. The top port is the return line, the bottom port is the pressure line. The bottom pressure port on the tranny should be hooked to the top port on your radiator. The bottom port on your radiator is the return and should be hooked to the top port on your tranny. Thats how it is. Even though its not really gonna matter either way.
    Just for clarification - on my 2005 Silverado with 4L60E, the top line from the transmission is connected to the top port on the radiator, and bottom to bottom. I verified this prior to cutting into the line to install the auxiliary transmission oil cooler. I then further verified it by, after cutting, tie wrapping a rubber glove to the lines on both sides of the cut. Then started the truck for 2 seconds. The part of the line still attached to the radiator supplied enough trans fluid into the glove to just about fill it. This demonstrates flow direction. Had I cut into the supply/pressure line, the other side of the cut (line coming FROM the transmission) would have filled the glove. It appears on some vehicles the orientation of the cooler lines is different at the radiator, but the TOP port of the transmission is always the return. If all else fails, start there. By design, the fluid being forced up through the bottom and out the top creates turbulence, and turbulent fluid will more readily dissipate heat. It's not a huge difference, by most accounts, to have them swapped though. The only time it's really relevant is when adding an auxiliary cooler. You want the cooled fluid from the OEM (radiator) cooler routed through the auxiliary cooler, and then back to the transmission for maximum cooling. Hope this helped.

 

 

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