The PP temp would always be 15* to 20* less then engine temp. I have a real ECT gauge, with the probe mounted in the thermostat housing. The PP gauge would run 160* ish. The Aluminum tranny hosing IMHO is a big heat sink for the engine.
I don’t think the pressure port is a good place to monitor tranny temp because no or very little tranny fluid flows by the probe in that spot, also the aluminum is about an inch and half thick in this spot.
Another thing I have noticed is the trans temp reading on the scan tool is skewed. In my observation while driving the tranny temp that is displayed by the PCM drop or increases 10* to 20* during a shift, I think this is because the reading is picked up in the solenoid pack and fluid sits static under pressure and dose not flow until the PCM commands a shift and a solenoid opens allowing fluid to achuate (yeah spell check don’t know) a clutch.
I think the most important place to but your probe is in the tranny line so you can see what your torque converter is doing. Some times with my 2wd trucks the TCT will get to 250* to 280* when moving big trailers with heavy loads around the barn yards (this will not happen with a 4x4 if you use Low Range) so when it gets this hot I put it in park turn on the tranny cooler fan (if equipped) and then let it cool down before I jockey the truck around more. This will keep from killing your torque converter also I never shut the engine off until the TCT is less than 180*
I have a 3 speed aux tranny (a Brownie Box) to put in my 97 F350 auto 2wd truck it has 1st 2:1 2nd 1:1 and 3rd 1:0.79 Then I will have my 4x4 like low range.
I will have more later I got to go to fire training
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