Transmission oil cooler lines bypass question - shady or legit?

Discussion in 'Freightliner Forum' started by PermanentTourist, May 6, 2021.

  1. PermanentTourist

    PermanentTourist Medium Load Member

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    So, I just got my 10 speed replaced with an in-house rebuilt unit at a little transmission shop in Fontana California.

    Apparently my old one went bad because I lost fluid because my cooler lines are bad.

    They could not get a hold of replacement cooler lines, apparently they are back ordered for a week or something.

    So they did something that's potentially fishy: plugged and bypassed the cooler lines.

    They are telling me:
    -That I don't really need them immediately because 10-speeds don't run hot.
    -That they bypassed them internally in the transmission so the pump will still circulate.
    - But somehow they did it in such a way that I can just put the lines back on and it will flow through the lines automatically without needing to take the transmission apart.
    - I don't need to be in a huge hurry to plug them back in, because all that's going to happen is my gear fluid will last half as long as it would otherwise, so like a year instead of two.

    All of this seems odd. I'm somewhat inclined to trust them because they do have a one year warranty and I doubt they would make something that would immediately destroy my transmission just so they have to redo it for free...

    But it's still odd to me that a transmission can just run internally like that without overheating as they are alleging.

    What are your thoughts? Is this a normal procedure or are they BSing me? Can I run this thing until I find time later in the summer to take the lines off of my old truck and put them on myself?
     
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  3. Magoo1968

    Magoo1968 Light Load Member

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    They just ran a hose from inlet to outlet on outside of transmission. I needed to do that before it was fine except on 100 k loads the temperature rose a bit higher than I liked but was still in safe zone. I had to wait 4 weeks to get lines on mine .
     
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  4. PermanentTourist

    PermanentTourist Medium Load Member

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    Okay, good to know.

    The good news for me is that I don't have no 100 K loads, just normal stuff. Heck, I don't even like taking anything over 30,000 pounds, it's just annoying to drive heavy stuff.

    The bad news is I don't have any kind of a transmission fluid temp gauge or anything like that. So all I've got to rely on is faith and trying to smell a weird smell if it starts overheating.

    Oh, one more weird thing. They did not run an outside hose, they just plugged it with metal screw in plugs. Apparently whatever they did is internal that they do on all their rebuilt transmissions. At least according to them.
     
  5. 062

    062 Road Train Member

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    Any hydraulic shop should be able to make the lines. If they already thrashed them call a dealer with the vin and they should be able to give you the specs to have them made.
     
  6. AModelCat

    AModelCat Road Train Member

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    If it ran low how did you not notice a leak? It holds like 4 gallons of oil.

    You should be able to get those lines built at a hose supplier. Probably cheaper too.

    Bypassing the cooler is usually ok as long as you aren't working it hard. Most coolers are just a heat exchanger with engine coolant anyways.
     
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  7. DUNE-T

    DUNE-T Road Train Member

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    Completely legit. I removed oil coolers from my trucks after loosing one transmission
     
  8. Brettj3876

    Brettj3876 Road Train Member

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    Lots of older trans don't have a cooler. Our old 13 doesn't. Usually runs in the 150 range
     
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