Transmission Oil Temp.

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   I found this advice for GMC pickups, (Silverado / Sierra):
“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. "

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coopercdrkey Members Profile Send Private Message Find Members Posts Add to Buddy List podders Helping podders - pHp Joined: 26 Aug 2012 Location: Cedar Key, FL Online Status: Offline Posts: 457	Topic: Transmission Oil Temp. Posted: 05 Sep 2013 at 8:35am
	I found this advice for GMC pickups, (Silverado / Sierra): “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. "
	Bob and Joyce Jennifer and Baxter, the Campin' Cocker Spaniels RP 177 "Key Pod" Chevrolet Silverado 1500 LT / Z71

Camper Bob Members Profile Send Private Message Find Members Posts Add to Buddy List podders Helping podders - pHp Joined: 26 Sep 2011 Location: Portland Oregon Online Status: Offline Posts: 913	Posted: 05 Sep 2013 at 8:10am
	We just returned from another camping trip, although this time we pulled some mighty high hills up to 4,200 feet on a hot day. My scanguage recorded a high temp of the tranny oil of 219 degrees. Was able to maintain 60 MPH without any problems. Normally the temp reads about 150-180 degrees. I had never seen the temp that high and became concerned. Upon my return did some internet checking and it seems that if you have synthetic transmission oil, the temps can get a lot higher, up to 300 degrees before things go wrong. Thought I would ask if anyone else has been monitoring their tranny oil temps and what concerns they had. The radiator temp never got above 215 but came down quickly upon cresting the mountain. Safe Travels.
	Camper Bob and Camper Sue Gracie the Wonder Dog (12 LB. Mini Dachshund) 2013 Rpod 171HRE(ORPod) 2016 Lance 1685 2015 Nissan Pathfinder