You really need to broaden your information base....Last word on this topic for me!
Do some search beyond GM vehicles and you will find many tranny's that routinely run 140-150 degrees normally and lower especially when not under a severe load which is most of the time. The tranny's in truck and some SUV's run these temperatures all day long....when not stressed. Most car documentation stresses that 175 is the upper limit for longevity of transmissions..the upper limit!