While taking the temp from the pan will give you a better temp reading of the overall trans temp, you will see the trans temp rise faster in the cooler line. The cooler line comes fron the torque converter goes through the coolers and returns to the trans as lube oil. If you check the temp between converter and cooler you will see 300F. in less than a minute when the converter starts to stall. It will give a better indication of how hard you are working the trans sooner than wiating for the sump temp to rise. The converter is the source of most of heat when its not in lockup.
Shifting out of lockup is the first downshift you feel when you are in overdrive (4). When it shifts out of lockup you will see about a 400RPM rise @70mph. This means you are turning the pump side(drive side) of the converter 400RPM faster than the turbine (driven side). Its shearing the oil and will get hot pretty quick.
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