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Thread: "Normal" Trans Temps

  1. #1
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    "Normal" Trans Temps

    Not towing or hauling, what is the normal operating temperature for the 4R100 trans?
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  2. #2
    SoCAPS Member Raul @ Stealth Automotive's Avatar
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    Quote Originally Posted by TurboYT View Post
    Not towing or hauling, what is the normal operating temperature for the 4R100 trans?
    about 80 degrees above ambient temp is normal....

  3. #3
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    After loosing my transmission at Lake Henshaw and getting a JW Towmaster installed. I have more of an understanding of running temps now :smirk:

    Stock setup - 9 Row Oil-To-Air (OTA) cooler.

    Not towing - No Hills
    Air temp 80; No AC; Trans temp 150-160
    Air temp 110; Running AC; Trans temp 190

    Towing (stock 9 row OTA cooler) - No Hills
    Air temp 80; No AC; Trans temp 190
    Air temp 110; Running AC; Trans temp 200

    Towing - 6% Grade; 11,000lb trailer
    Air temp 80; No AC; Trans temp 230
    Air temp 110; No AC; Trans temp 235

    Time for a OTA upgrade!

    Raul nailed it. 80 above ambient with stock cooling system working correctly. Upgrade to the 6.0 31 row OTA cooler and the temps should always stay below 190-200.

    EDIT: Of course this all depends on how you are measuring your transmission temperature. If you have an external gauge connected to the driver side test port, then your max temp you should allow is 225*. If you are using a programmer (Hyper X, Edge, etc...) display, it is getting the info from the PCM. 240* should be max as this is the temp at the valve body and will be higher then the test port.

    So you will hear people saying their transmission temp runs around 150 most of the time while others will state 190 most of the time. This is dependent on where the temperature is being measured :) I have both. ScanGaugeII measures PCM temp and a ISSPRO pillar gauge measures test port temp.

    Good Luck
    Larry
    Last edited by Rogue1970; 07-08-2009 at 01:59 PM.

  4. #4
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    Quote Originally Posted by Rogue1970 View Post
    After loosing my transmission at Lake Henshaw and getting a JW Towmaster installed. I have more of an understanding of running temps now :smirk:

    Stock setup - 9 Row Oil-To-Air (OTA) cooler.

    Not towing - No Hills
    Air temp 80; No AC; Trans temp 150-160
    Air temp 110; Running AC; Trans temp 190

    Towing (stock 9 row OTA cooler) - No Hills
    Air temp 80; No AC; Trans temp 190
    Air temp 110; Running AC; Trans temp 200

    Towing - 6% Grade; 11,000lb trailer
    Air temp 80; No AC; Trans temp 230
    Air temp 110; No AC; Trans temp 235

    Time for a OTA upgrade!

    Raul nailed it. 80 above ambient with stock cooling system working correctly. Upgrade to the 6.0 31 row OTA cooler and the temps should always stay below 190-200.

    EDIT: Of course this all depends on how you are measuring your transmission temperature. If you have an external gauge connected to the driver side test port, then your max temp you should allow is 225*. If you are using a programmer (Hyper X, Edge, etc...) display, it is getting the info from the PCM. 240* should be max as this is the temp at the valve body and will be higher then the test port.

    So you will hear people saying their transmission temp runs around 150 most of the time while others will state 190 most of the time. This is dependent on where the temperature is being measured :) I have both. ScanGaugeII measures PCM temp and a ISSPRO pillar gauge measures test port temp.

    Good Luck
    Larry
    What about measuring at the pan (what should it be)..?

  5. #5
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    Trans pan sump temp is the same as the test port. So you would want no higher then 225* at the sump.

    FYI...
    I heard that the stock transmission gauge or better known as the "Idiot Light Gauge" shows HOT at 275* in the valve body. DO NOT RELY ON THE FACTORY GAUGE.

    Driving tonight, I saw 175* in the valve body(PCM reported temp) and 155* in the test port (ISSPRO Sensor) running empty on I-5.

    EDIT: Here is a nice test of the stock Ford Transmission Temp Gauge
    Last edited by Rogue1970; 07-08-2009 at 11:02 PM. Reason: Link Update

  6. #6
    SoCAPS Member Fastpowerstroker's Avatar
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    80 degrees over is the rule of thumb. To many variables though. I have my isspro mounted in a deep mag-hytec but am also running a b&m hi -tec cooler with a fan. Even going up hills in summertime I rarely see 180deg. Towing is more and I have had to pull over to cool down
    2003 F350 7.3l, 60Kmi, XLT, CC, LWB, SRW, 4X4, 4R100, 3.73LS. 4" BDS lift w/315/75/R16 Toyo MT's on Mickey Thompson classic II wheels. Isspro gauges, Mag-Hytec tranny pan, B&M tranny cooler w/fan. Line-X bedliner. Firestone air bags.

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