03 yukon denali 4L60E
#3
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
#5
Retired
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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2002 *-10 5.7 V8
2023 Jeep Rubicon Diesel
Retired Administrator
2002 *-10 5.7 V8
2023 Jeep Rubicon Diesel
#8
Retired
The most I see on mine is 175 at 85*.
Heat is a trans killer. External trans coolers are far better than nothing.
Heat is a trans killer. External trans coolers are far better than nothing.
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2002 *-10 5.7 V8
2023 Jeep Rubicon Diesel
Retired Administrator
2002 *-10 5.7 V8
2023 Jeep Rubicon Diesel
#9
Senior Member
True Car Nut
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
#10
Senior Member
Posts like a Turbo
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.
2004 Bonne SLE
1971 Chevelle SS
2004 Bonne SLE
1971 Chevelle SS
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