if the TCC is active it will actually keep the fluid cooler, it gets warmer with the tcc shut off. so shut of atleast 1-4th gear to aid in warm up, and reduce clunk.
i also found zeroing out the tcc slip tables also made the trans run cooler because ther is no more 10-30 rpm slip difference between the converter and internal clutch.
today i drove 100 miles, at 65 mph, fully locked up in overdrive no slip on the converter, transmission is running at 113 degrees F, ambient air temp was 55-60 degrees out. my engine t-stat is a 175 F from katech, i am thinking about swaping in the cts-v 196 t-stat for more heat. but she runs so good, I averaged 34mpg fuel consumption for 40 mile trip average. this was a flat almost 1-2degree downhill section
in city driving my tcc is off for 1-4th gear so my fluid runs about 145 degrees F. stop and go traffic , hot rodding around town stuff