A little FYI I have compiled from many transmission srvice/lube info etc.This is re AUTO trans oil temps.
TRANSMISSION LIFE EXPECTANCY
Miles Vs Temp & Issues
Temp Miles Life/ E Conditions
315 degF 800 Seals & clutches burn out, oil forms carbon
295 degF 1,500 Plates slip
260 degF 5,000 Seals Harden
240 degF 10,000 Varnish forms
220 degF 20,000
195 degF 50,000 LOW HEAT = HIGH MILEAGE
175 degF 100,000 Bingo!....fit a trans temp gage then a cooler!!!!