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  1. #1

    Default How long does the tranny fluid need to warm up?

    New owner here, 2013 Burb 1500 5.3 4x4 with a towing package, ie. aux tranny cooler. Everything seems great on the truck with one slightly suspicious thing... Is 15-20 minutes not long enough to warm up the tranny fluid to the normal operating temperature (150-200 F)??? It has gotten cold here (40s), but I see my ATF temp get up to maybe 100 F and stay there rather stubbornly (on my usual 15-20 minute trips). Is this warm enough for the tranny to operate at? Is there a thermostat on the ATF cooling system or does it always flow thru the aux cooler ALL the time? Maybe the low temps are not allowing it to warm up?

  2. #2
    Sr. Mechanic poncho62's Avatar
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    Sep 2013
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    Default

    Better too cold than too hot

    The transmission fluid runs through the trans cooler and also through the rad. I guess that warms it up once the engine comes up in temp. I wouldnt be concerned

    [B]1997 GMC

  3. #3
    Sr. Mechanic poncho62's Avatar
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    I installed a tranny gauge in my truck this morning....Its about 35-40 degrees around here too...Went into town to run a few errands. Temp on gauge went to about 125F, that was about it.

    [B]1997 GMC

  4. #4

    Default

    Here's a chart of average temperature vs fluid life. Lower temps are better, as long as the ATF stays above 100F you shouldn't have hard shifts really. My Tahoe also has a factory aux cooler and it doesn't seem to have any problems with low fluid temps, but I don't have a temp gauge on it so I'm not sure what temps I'm running.


    1996 Chevy Tahoe LT 5.7L V8 4X4 205,000+ miles. Built proudly at Janesville Assembly in Janesville, Wisconsin
    Basic mods: Lights all over, bunch of electrical work, and a couple cooling mods.

    Check out my other mods in My Garage: http://www.gmtruckclub.com/forum/sho...t-Tahoe-4-Door

  5. #5

    Default

    ^^^^^^^cool chart of Info.. thanks for sharing.




    2011 Silverado CrewCab 5.3L*Ram Air Look Cowl Induction Reflexxion Hood*6" Pro Comp Lift*Flowmaster Dual exhaust*Perfect Launch Rear Diff. Cover*Led Smoke Taillights*L.E.D.Smoke 3rd Brakelight*60" L.E.D. Tailgate Bar*Rearview Mirror Reverse Camera and Sensors*Smoke Headlight Covers*Front Bumper Grill Insert*Deezee Black Alum. Diamond Rail covers*20" Ultra Motorsports Rims wrapped with 35.5"B.F. Goodrich Tires*Inchannel Raingaurds*CAI*Bullydog GT Tuner*Alpine Amp*Boss 6x9's*Boston Acoustic Subs*Terrantula Tweeters*Custom Sub box*Red Led Interior Accents*5% Ultimacool duo tint rear window and doors, 20% front doors*Custom Vinyl Graphics*Demolded*Debadged*Painted drums and calipers*
    Future Mods Include: Custom Interior Hydrographics, Electronic Rollup Toneau Cover, 4.56 Gears, Painted rear bumper

  6. #6
    Master Mechanic BurbanMan's Avatar
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    Quote Originally Posted by Conlan Rose View Post
    Here's a chart of average temperature vs fluid life. Lower temps are better, as long as the ATF stays above 100F you shouldn't have hard shifts really. My Tahoe also has a factory aux cooler and it doesn't seem to have any problems with low fluid temps, but I don't have a temp gauge on it so I'm not sure what temps I'm running.
    i wish forum runner had a thank button lol at pepboys, we recommended the average fluid/filter exchange for every 45-50k miles
    Chuckie!!!


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