Tranny cooler replacement procedure

Discussion in 'Towing & Hauling' started by pajeepman, Aug 12, 2016.

  1. pajeepman

    pajeepman Senior Member

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    03 Laramie quad cab 5.9 liter with tow package.
    I need to replace the large transmission cooler as it is seeping/weeping fluid from the top corner near the middle of the truck. Actual physical replacement is not an issue I was just wondering about getting fluid back into it. Is there a proper to prevent the transmission from spinning with a giant air bubble in the lines.

    I plan on towing a 3200 pound camper 12 hours to Maine. Stock cooler looks plenty big enough and probably don't need to add another one or anything correct?

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  2. HemiLonestar

    HemiLonestar Senior Member

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    I didn't have any issues when I replaced mine with the factory 1 ton cooler, just installed it, ran it up to temp and checked the fluid.
     
  3. crash68

    crash68 Senior Member

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    pre-fill the new cooler as much as possible before you install it.
     
  4. pajeepman

    pajeepman Senior Member

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    Thought about that but the inlet and outlet are both at the same level, at the bottom. Easy to do on my old '96 ram with only an in radiator cooler. Thought about trying to hook up outlet and use a big syringe/pump kinda thing and force some in then quick hook up inlet.

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  5. Jnovuse

    Jnovuse Junior Member

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    Transmission has a breather tube, install the part, fill up the transmission to proper levels (with truck off), start truck, let it get warm/shift through gears while not moving, check fluid again, go for a brief drive, check fluid again.

    A day or two later, check fluid again.

    Easy peasy.
     

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