I have an update. I discovered that I can not trust my temp readings because my thermometer seems to read cold, at least sometimes. I was idling in neutral for about 3 minutes at a railroad track, and the thermometer dropped to about 90 degrees F, which was about 5 degrees below ambient temp. Not possible. So once I got home (about 30 seconds later) I felt the pipe that I mounted my temp sensor to, and it was hot even though the thermometer showed ~90 degrees. The thermometer was still securely clamped to the pipe. I would guess that the pipe was at least 120 degrees, probably more, so I am going to install a real trans temp gauge.
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