BUT!!! .....in the 46/47 RH family the fluid temp sensor was IN the line coming off the converter pre heat exchanger. I actually used this line on my RE trans as it made a great place to add an aftermarket sending unit.

On my race car I have an aluminum log style heat exchanger, and then added another cooler via a new radiator with a stock style in tank cooler. In my pea brain I like to see where the fluid is hottest as it’s temperature that can break the fluid down. If I can manage the fluid at its hottest point, I know the sump is fine.