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Thread: overheating auto transmission.

  1. #1
    SoCAPS Member Nvrsatisfied's Avatar
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    overheating auto transmission.

    trans overheating after 2-3 hours of driving.
    Trans was rebuilt about 5 years ago and upgraded with all the good parts and aftermarket larger cooler. Ive noticed once the needle starts to go up and get close to the yellow if i put truck in neutral and coast it will start to cool down. Shifts super hard once the trans gets close to overheating. Fluid is good and recently changed with filter and also added a maghytech deep pan also the maghytech kit that gets rid of the crossover tube on the trans. Truck has 37s and recent gear change to 4.30. I thought the overheating problem was because of the 37s and stock gear ratio but its still doing it. I daily drive truck from 30 miles to 200 miles a day and never overheats until i get on freeway and go about 2-3 hours and or hit a steady uphill grade. Any suggestions would be great thanks.

    2002 f 250 7.3 auto 4x4

  2. #2
    SoCAPS Member domesticdiesel's Avatar
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    I have 6.0 31 row trans coolers and adapter kits in stock. They are over 3 times the size of your stock cooler and direct fit bolt on cooler. The cooler is 297.50 install kit 60.00. I can install it for you for 150.00 you can buy it over the counter or I can ship it to you.
    John

  3. #3
    SoCAPS Member Nvrsatisfied's Avatar
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    I have a large cooler already. 1 of the first things i did when i got the truck.

  4. #4
    SoCAPS Member Nvrsatisfied's Avatar
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    Cant belive my post has been viewed almost 200 times and the only reply is a sales call.

  5. #5
    SoCAPS Member sanger's Avatar
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    My guess is your converter not locking or when the trans gets hot is the cooler hot? All the fluid It maybe going through the bypass and not the cooler.
    Last edited by sanger; 10-14-2016 at 11:15 PM.

  6. #6
    SoCAPS Member 2005F250's Avatar
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    I would guess it has something to do with the last fluid change, if it wasn't happening before that. There is a theory on the high capacity pans that since they hold more fluid once the fluid gets hot it takes longer to cool since there is more fluid in the system. Or like Sanger was saying a TC lock symptom.
    Adam

    02 F250 cc/sb 7.3L 2wd

    02 F350 sc/lb 7.3L 4wd

  7. #7
    SoCAPS Member
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    Did they install a inline transmission fluid filter when they rebuilt the trans? Maybe it’s clogged up and restricting fluid from getting through at higher speeds. Or installed backwards?

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