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How big is too big on transmission fluid lines?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by grumpy, Feb 18, 2003.

  1. grumpy

    grumpy 1/2 ton status

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    What ID would cause an excessive pressure drop? I am installing an aftermarket trans cooler and wondered about the size of the line.
    David
     
  2. the professor

    the professor 1/2 ton status

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    The oil flow for the cooler runs thus..
    --
    from the outlet in the converter...to the cooler, back into the case for transmission internal lubrication..
    --
    You cannot make the lines TOO BIG for functional reasons, because there is the case restriction in and out of the trans...You can make them TOO SMALL
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    The flow through the cooler is limited in any case, and rarely exceeds 35psi
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    The problem with very large lines, is they do not give up enough heat...a smaller line actually does better..(more area per volume)
    --
    Staying with the stock diameter is probably best...
    /forums/images/graemlins/cool.gif /forums/images/graemlins/truck.gif
     

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