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700r4 Temp?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Itali83, Jul 12, 2001.

  1. Itali83

    Itali83 1/2 ton status

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    I know this is a worn out subject, but I just put a tranny temp guage in the line coming FROM the transmission. WHat is the save/normal temp I should be getting?? it is the hot oil coming out of the tranny so it is really telling me what my tranny is running. If I remember 230 and up is NOT good. and 160 ish is save for tooling around the streets. Please tell me somt temps, thanks.
    Ben 87 Jimmy
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  2. ftn96

    ftn96 1/2 ton status

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    Running at no higher than 190 is good. Over that the fluid starts to break down. You dont want it too cool either.

    When in doubt.....Use the Saws-all[​IMG]
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  3. newyorkin

    newyorkin 1 ton status

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    I'd heard the same thing as ftn, and that it should be around normal engine temps. But thinking about it, the engine temp sender is in the manifold and the head, where it's getting a true reading of the hot coolant temp. The stock tranny cooler is on the feed-to-engine side of the radiator, where the engine coolant has already been cooled, so the tranny fluid temp would be lower than the engine temp, since it's being cooled by engine coolant lower than the engine temp. SO I'd say 160 sounds about right.
    So, then, 190 would sound like a good limit to me. Especially if that's the fluid breakdown point!

    Ratch
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  4. Itali83

    Itali83 1/2 ton status

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    I just ran around for a good 45 mins, intown then at freeway speeds, It never went higher than 150 so I'm happy. Thanks guys!
    Ben 87 Jimmy
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  5. Espen88k5

    Espen88k5 1/2 ton status

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    I'v been wanting one of those. I can get a oiltemp gauge with sender that goes upp to 140 Celcius, Anyone know how many farenheits(sp) that is?

    Also if you could explain in detail how you tapped into the lines to get the reading I'd be gratefull.

    Thanks!

    <font color=red><A target="_blank" HREF=http://www.espen88k5.alloffroad.com>http://www.espen88k5.alloffroad.com</A></font color=red>
     
  6. Bubba Ray Boudreaux

    Bubba Ray Boudreaux 1 ton status

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    284F

    "I am Republican. Not a baby-killing, tree hugging, land grabbing, touchy feely, hypocrite wuss democrat!"
     
  7. Fish

    Fish Registered Member

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    Here's the formula for the conversion:

    ((degrees C) X 1.8) + 32 = F

    (140*1.8)+32 = 284
     
  8. ftn96

    ftn96 1/2 ton status

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    Damn I feel dumb amoung such intelligence around here[​IMG]

    When in doubt.....Use the Saws-all[​IMG]
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  9. Bubba Ray Boudreaux

    Bubba Ray Boudreaux 1 ton status

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    I cheated, cause if y'all ain't cheatin, y'all ain't trying!! Actually, I went thru an automotive tech program awhile back and had one instructor that blasted us with stuff like that, hydraulic pressures, conversions, Ohm's Law, atmosperhic pressures and of course the whole how many BTUs does water at 32 degrees have to lose to change to ice at 32 degrees. Of course I've forgotten it, but I kept all my books.

    "I am Republican. Not a baby-killing, tree hugging, land grabbing, touchy feely, hypocrite wuss democrat!"
     
  10. Itali83

    Itali83 1/2 ton status

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    Espen88k5, I plumbed into the factory cooler line that goes from the transmission. i got the autometer tranny temp and the mechanical sender is really big and oaffy so I had to get a lot of fittings. I used tubing fittings. Got a T fitting that fit the sending unit, then used a bushing that decreased the size of the fitting, then got one more fitting that is 5/16" (i think that was the size of the line) and that got me to the size of the line. All in all, I had to cut 4 inches out of the line because of all of the fittings. Kinda hard to explain, but I hope this helps. I did plumb it into the line that comes FROM the transmission so I get a reading on how hot the tranny really is running. If you have any more questions, PM me and I'll help you or anyone out.
    Ben 87 Jimmy
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  11. Here is some info I got from the site mentioned below: Most manufacturers of transmission fluid will tell you that a continuous steady 160 to 165 degrees will give maximum longevity for the fluid to maintain its peak condition. I'm sure most of you have seen the charts that show the rapid destruction of transmission fluid properties as operating temperature increases. Most charts show a 50% loss of fluid life for every 15 degrees of operating temperature increase above their designed ideal operating temperature, normally 165 degrees F. This is the reason we recommend each fluid cycle start at 150 degree F. or less. This is also why we place the temperature probe in the transmission pan rather than some other location in the system.

    Try this site for some info on a 700R4 <A target="_blank" HREF=http://www.700R4.com>http://www.700R4.com</A>

    [​IMG]<font color=red>BigBurb[​IMG]
    <font color=purple>IF YOU'RE SCARED, SAY YOU'RE SCARED !!
     
  12. Espen88k5

    Espen88k5 1/2 ton status

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    I was first thinking of making a regular engine-oil temprature sender work, and just make a new treaded hole in the side of the tranny oil pan, but maybe I should do it right instead[​IMG]

    Thanks

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  13. ftn96

    ftn96 1/2 ton status

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    Well, I should have stated my first post more clearly. Over 190 teh fluid is pretty much already on its way to fluid heaven.

    When in doubt.....Use the Saws-all[​IMG]
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  14. 6.2Blazer

    6.2Blazer 1/2 ton status

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    If you stay below 190 at all times you should never have any problems. The tranny and fluid can live up to around 210-220, but only for very short periods of time and it will decrease the overall life span of both. If you ever get up to 230 or higher the fluid will be history and the tranny will have a greatly reduced life and can fail (seals and such start to break down).
     
  15. ftn96

    ftn96 1/2 ton status

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    Yeah, I haven't installed a cooler or temp guage myself. So I dont really know what kinda temps Im running.
    But I have the deep aluminum pan with the drain plug. You all might think this is over kill, but I drain the tranny fluid at every oil change and refill it. Then change the filter every 10,000.
    the $[censored] is cheap and its preventative and its easy with the drain plug.

    When in doubt.....Use the Saws-all[​IMG]
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