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tranmission temp

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Oblin Goblin, Jun 6, 2001.

  1. Oblin Goblin

    Oblin Goblin 1/2 ton status

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    What would be a good safe maximum teperature for a 700r4 transmission with the temperature sender in the pan?

    Thanks
     
  2. ericsoffroad

    ericsoffroad Registered Member

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    working temo is 175 and to hot is 200 or at least that is what my boss says
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  3. ChevyCaGal

    ChevyCaGal 3/4 ton status

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    I was told 180.... not sure how right that is because I never checked into that... kind of curious myself since that's the tranny I run too....

    "Suck Fumes Ford Boy"
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  4. dyeager535

    dyeager535 1 ton status Premium Member

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    Somebody else that deals with these things more often than myself may chime in, but since (factory) the cooling lines were routed thorugh the radiator, 195 should be a "safe" operating temp. I actually believe you are getting "too hot" as you start approaching 250. You are worried about the fluid breaking down at that point.

    Dorian
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  5. newyorkin

    newyorkin 1 ton status

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    Speaking of this, where can one pick up a tranny temp guage/sender? Is it a standard temp guage mounted in the tranny? I guess that would work since it just measures degrees.

    Ratch
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  6. Blazer1970

    Blazer1970 1/2 ton status

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    The factory gauge on my new truck goes into the red at 250 degrees. I assume that is where the fluid will start to cook.

    Tim

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  7. BlazerBoy

    BlazerBoy 1/2 ton status

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    When I had my 7004r it would read anywhere from about 150-190 max. I had to beat on it to get it in the 190's so I would say anything over 200 would be getting pretty hot. Hope this helps

    BlazerBoy
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  8. jarheadk5

    jarheadk5 1/2 ton status

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    I seem to recall reading, at different times in different magazine tech articles, that most ATF starts to cook around 250deg F. Seems to be the consensus here, too...

    I also seem to recall that the fluid IN the pan has already gone through the cooler and is waiting to be pumped back through the tranny. If this actually is the case, then your pan-mounted gauge sender isn't telling you how hot the tranny truly is. Thay's why I'm getting a second sending unit, plumbing them both in the cooler lines, and wiring them through a switch, so I can see the "hot" temp and the "cool" temp. This will add immensely to my comfort level, since I have to make my 700R4 last for quite a while...

    I got my gauge from Summit. It's an Autometer Sport-Comp 2 5/16" electrical gauge. It was like $45.

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