tropical36 wrote:
rgatijnet1 wrote:
Transmission fluid is the hottest coming out of the torque converter. Pan temperature is the temperature of the fluid after it has gone through the cooling radiator and is OK to monitor but it really doesn't tell you how hot your fluid got before it was cooled. Since the transmission fluid life is determined by the maximum temperature that it sustained, the output temperature, before the radiator, is the best place to monitor it.
Allison transmissions put their internal sensor at the torque converter output to give a good accurate reading of the maximum temperature the fluid has reached.
I agree with the output temp. before the cooler. Now would you happen know how it's done on a GM4L80E, cuz they will go into limp mode, without warning, when too hot, even thought the engine temp. is still OK.
On the GM4L80E transmissions after 2006, GM recommends using Dexron 6 transmission fluid. This is much like Allison changed from Dexron 3 to Transynd fluid. I know that when I made the switch to Transynd, my transmission operating temperatures went down. Perhaps you should check to see if you can switch from Dexron 3 to Dexron 6 fluid and see if that helps.