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Which line in IN for a trany cooler?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 87superblaze, Feb 25, 2002.

  1. 87superblaze

    87superblaze 1/2 ton status

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    I am installing a transmission cooler for my 700R4. What line is the return line to the trany? Is it the top or bottom line on the radiator?

    Your help is much appreciated!! Otherwise I have to do it the hard way. This will really save me time. BTW, 1987 TBI 350.

    Nick

    My Truck <a target="_blank" href=http://www.community.webshots.com/user/nicksm79>http://www.community.webshots.com/user/nicksm79</a>
     
  2. Stomp

    Stomp 1/2 ton status

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    99.8% sure the top is the "in" line and the bottom is the return

    <a target="_blank" href=http://www.geocities.com/custar/index.html>Your parents WANT you click here, NOW!!</a>
     
  3. Seventy4Blazer

    Seventy4Blazer 3/4 ton status

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    top it is,
    Grant

    take me drunk, i am home
    www.geocities.com/seventy4blazer/parts4sale.html
     
  4. RESTORE89

    RESTORE89 1/2 ton status

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    does it matter?
    wont the cooler work no matter where you install it in the line?
    i am not being smart, i just bought a cooler today from napa, and was planning an install in the next few days, and did not think it mattered
    chris

    It needs a bigger motor.
    what's in it now?
    doen't matter it NEEDS A BIGGER MOTOR
    89 350tbi/700r4h/np208/4.11's
     
  5. 87superblaze

    87superblaze 1/2 ton status

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    Yes, it really does matter. If the ATF goes throught the cooler first and then throught the radiator, it will defeat the porpose of having a cooler. If you think about it, the ATF will cool down going throught the cooler but will heat up when it goes throught the radiator. The reason for the cooler is because the radiator is still too hot for ATF.

    The most effective way to use a cooler is to have the ATF go throught the cooler last. Right before it goes to the transmission.

    BTW, thanks everyone for replying so fast.

    My Truck &lt;a target="_blank" href=http://www.community.webshots.com/user/nicksm79&gt;http://www.community.webshots.com/user/nicksm79&lt;/a&gt;<P ID="edit"><FONT class="small">Edited by 87superblaze on 02/25/02 10:02 PM.</FONT></P>
     
  6. Seventy4Blazer

    Seventy4Blazer 3/4 ton status

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    it is just better to put it on the low pressure side, less leaks to worry about. using hose clamps is ok, but after time they tend to wear out the rubber. using the low presure side makes it so you can use larger tubes also(it helps drop the presure).
    Grant

    take me drunk, i am home
    www.geocities.com/seventy4blazer/parts4sale.html
     
  7. RESTORE89

    RESTORE89 1/2 ton status

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    so then i should install it inthe bottom line?

    It needs a bigger motor.
    what's in it now?
    doen't matter it NEEDS A BIGGER MOTOR
    89 350tbi/700r4h/np208/4.11's
     
  8. GMCLegacy

    GMCLegacy 1/2 ton status

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    your bottom line should run into the radiator, then out of the radiator to your new aux cooler, out the aux cooler to the top line in your tranny.
     
  9. Tybee

    Tybee 1/2 ton status

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    Why not just use the cooler and bypass the radiator?

    1984 GMC Jimmy 379 diesel, 700R4, 3.73s, 31x10.50 x 15
     
  10. 87superblaze

    87superblaze 1/2 ton status

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    I am not sure about that one. I thought about it a few times but don't have the nads or the money to try it. It sounds like it would work but I don't want to be the one to fry my new trany!!

    If this works, let me know LOL!!!

    My Truck <a target="_blank" href=http://www.community.webshots.com/user/nicksm79>http://www.community.webshots.com/user/nicksm79</a>
     
  11. 87superblaze

    87superblaze 1/2 ton status

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    Here is a primative diagram on how to hook up your trans. cooler.

    Click on my webshots Link below and look for Trans. Cooler Diagram.

    Thank You and Your Welcome! :)

    My Truck <a target="_blank" href=http://www.community.webshots.com/user/nicksm79>http://www.community.webshots.com/user/nicksm79</a>
     
  12. Thunder

    Thunder 3/4 ton status

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    I have always installed my Trans coolers with the tranny fluid going thru the aftermarket cooler first then thru the radiator then back to the trans. I have never had a problem running them that way.. Most instructions recomend they be installed that way. Because the water around the stock tranny cooler has already passed thru the cooling coils its pretty cool on that side of the radiator anyhow.(unless your radiator is bad or plugged up)
    It really doesn't matter much which way they are installed in warmer climates.
    But in colder weather, running it thru the radiator helps keep the fluid in its best operating range ( around 150-160).
    Running too cold of fluid thru yur auto tranny can damage it also.

    <a target="_blank" href=http://coloradok5.com/gallery/Thunders-Blaze> Blazer pics</a>

    <font color=blue>Nevada... Where the pavement ends and the west begins
     

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