BigKahuna
Well-Known Member
Yeah......I keep telling my wife that it's 75 MPH on 77, 85, and 485.......
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GMs response to the 6l80 transmission temp question.
We understand the importance of this information to keep the vehicle in the best condition and we are more than happy to provide the information for you. The normal operating temperature is at 180°F to 200°F or 82°C to 93°C. The message 'TRANSMISSION HOT IDLE ENGINE' will appear on the Driver's Information Center (DIC) if you drive the vehicle when the transmission fluid is overheating. You will also hear a chime if the transmission fluid gets hot. Driving with the transmission fluid temperature high can cause damage to the vehicle. Stop the vehicle and let it idle to allow the transmission to cool. This message clears and the chime stops when the fluid temperature reaches a safe level.
I hope this information has been of help. If you should need further assistance, simply reply to this email or call our Chevrolet Customer Assistance Center at 1- 800-222-1020. Customer Relationship Specialists are available Monday through Saturday from 8:00 a.m. to 9:00 p.m., Eastern Time. I am usually in the office Monday through Friday between the hours of 8:00 a.m. and 5:00 p.m., Eastern Time.
From GMC4x4 site
"In the February 2011 issue of Trailer Life magazine RV Clinic in response to a reader about the maximum transmission temperature allowed in a 2009 Chevy Silverado, the Tech Team had this response.
"General Motors’ in-house towing team expert provided RV Clinic with this statement: The maximum allowable automatic transmission fluid temperature is dictated by the transmission oil itself. The oil begins to degrade significantly above 270 degrees Fahrenheit, so we design vehicles so that in all but the most extreme conditions, the fluid temperature in the transmission sump stays below 270 degrees F.
We allow for up to 285 degrees F in extreme conditions (i.e. towing a trailer with combination loaded at GCWR in Death Valley). But for customer usage anywhere else in the country, even at GCWR, transmission sump temperature should stay well below 270 degrees F. Above this point, certain internal components, such as seals, begin to disintegrate rather quickly. Although newer synthetic fluids can withstand higher temperatures we still recommend this (270F) as a maximum temperature. ""
Here was my initial post not sure why it didn't show in the same multi quote window though.Most all tranny oil is synthetic or a blend and is more than capable of running 230-250*f safely but if higher than that for an extended period would warrant a fluid change. Don't buy into the gauges on the dash they are about the most inaccurate things on the planet, nothing more than indicators, I have add on OBDII gauge tuners on most of my vehicles and while in normal operating temps on the dash gauge can be a 40* difference on the actual readings.
If you did not see any warning lites don't worry about it, they are set to alarm before danger zone temps set in to let you slow down or cool down before damage occurs.