Budrbean, the temperature readings you provided are very informative. Please keep us posted as you accumulate more drive time and a wider range of driving conditions. I expect to see much higher temperatures when towing and when there is a prolonged strain on the transmission. For example, when towing up some long hills. The continued high temperatures coming out of the tranny (where you're measuring) will eventually raise the fluid temperature in the pan so the fluid going in the tranny will be hotter causing the fluid coming out to be even hotter. The needle on your gauge may be pinned on 250! I've seen my temps (after the cooler) at 210-220 before. This was from towing on a 90 degree day.
It sure would be nice to see some comparative pre-bypass figures
The pre-bypass figures would be the same. The temperatures Budrbean is reading is at the transmission output, before the radiator cooler.
I would like to see if fan makes a difference while towing at 60MPH.
The fan should not make a difference at 60mph. The purpose of the fan is to generate airflow when no airflow is present (vehicle stopped or traveling slow). At 60mph, the trans cooler is already getting the maximum amount of airflow across it.