03 yukon denali 4L60E - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-16-2014, 01:39 PM   #1
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Default 03 yukon denali 4L60E

Can someone tell me what the normal operating temp of the transmission is under normal driving conditions I have a factory cooler
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Old 07-16-2014, 04:21 PM   #2
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i only look at mine when im towing but should go up to around what the rad is at, quite a bit slower though. why?
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Old 07-16-2014, 05:19 PM   #3
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Had the car for 2 years never noticed it get near 200 than a while back I sat still with it idling when I started driving the tranny was wining and not shifting good. Once I parked it and let it cool it worked fine but would reach 200 if left idling for too long. Then last weekend I made about a 10 to 15 mile trip and by the time I got where I was going it was hot and not working very well. That'* with only stopping at stop signs. I have since flushed the system and added Lucas its better but still gets about 180 while driving
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Old 07-17-2014, 07:13 AM   #4
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180-200 is cool. when you tow a big camper it gets to 220-240 and thats fine. if yours is acting up it for some other reason
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Old 07-17-2014, 10:12 AM   #5
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Uh, no. I'm seeing everywhere, below 200 is BEST. Anything over 200 is bad. Just do a Google search for "4L60-e operating temp"
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Old 07-17-2014, 11:54 AM   #6
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maybe if you arent hauling anything
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Old 07-17-2014, 11:58 AM   #7
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never mind i was thinking the engine temp, is what cant go over that, mike is right. i dont say that very often, lol
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Old 07-17-2014, 11:59 AM   #8
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The most I see on mine is 175 at 85*.

Heat is a trans killer. External trans coolers are far better than nothing.
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Old 07-17-2014, 12:06 PM   #9
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i only watch mine when towing my camper in the summer but i only go 10 miles if that. i have the factory external trans cooler and it most times slowly rises to a bit lower than the engine temp
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Old 07-17-2014, 05:52 PM   #10
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Consistent transmission fluid operating temp of 195 will give a fluid life of 50k, when it'* all new. During a typical pan drop fluid change your only changing out plus or minus 50% so a 25k fluid change is prudent. I live in the flat country of SC and no towing so I haven't added an external cooler on Bonne. You don't have to tow to run the trans temp up. Way back in 07 I had a rental gran prix that had a factory trans temp gauge in the dic. From Seattle (basically sea level) climbing up to 4000' going over Stevens Pass on US Highway 2 the trans temp reached 250 degrees, I only hope the new owner didn't daly with a trans fluid change. One can find fluid life vs. trans temp via google.

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