temp. of auto trans

[Mike C]

i have dtt valve body and convertor with trans temp gauge in the line. when i am sitting in traffic for around fifteen minutes my temp is around 200-215 degrees driving around temp very seldom goes over 180 around town and 150 on highway. any one else seeing these temps and should i be concerned.

 

[Evan A. Beck]

As long as the coolers are working ok, there's not much to worry about... May want to add a sender in the pan so you can see how much cooling is being done to the oil after leaves the hot side of the trans. Gotta remember, you are taking it's temp where it is the hottest, and it is not using oil at that temperature for lubing and shifting.

 

[Bill Kondolay]

Mike,



In heavy traffic our TC runs hotter than factory or milled stator converters. There are discussions from time to time about how our tc actually run cooler than factory tc. How it works is like this,



the 618-89 model runs approx 10 degrees hotter than factory or milled while sitting in drive with your foot on the brakes.



the 618-91 model runs 15 degrees hotter than factory or milled while sitting in drive with your foot on the brakes.



the 618-93 model runs 20 degrees hotter than factory or milled while sitting in drive with your foot on the brakes.



The reason for this is because the tc is trying to drive the vehicle forward, and since you are holding the vehicle back with the brake , it generates more heat.



Now when the vehicle is moving our tc actually generates less heat because there is less slippage in fluid coupling.



The guys in rural areas always report cooler temps , and the guys towing report as much as 100 degrees cooler temps under load in fluid coupling.



Guys in heavy traffic , usually have the higher temps mentioned above.



If the temps are being measured in the front trans cooler line, the temps you have are quite normal even for a factory tc in heavy traffic.



Running synthetic oil will help with temps as will slipping the vehicle into neutral when stopped at long traffic lights.



Off all the tc models mentioned above the 618-93 will actually run the coolest on the open road, then 91 the the 89 simply becuase of the tightness or efficiency of the converters.