Just for S&G my tow car (Jeep Grand Cherokee with Pentastar and trailer towing package) has readouts for coolant, engine oil, and transmission oil temperatures.
With a 180F thermostats and "aggressive" radiator fans, nothing gets over 200F even with AC on MAX. Coolant usually runs 90-100F over ambient.
Biggest boon to transmissions is lockup, temp stays down when locked. I'll drop a gear or two on Interstate hills to stay out of PE and in lockup.
Agree, racing is different (why I had a 3.55 in my B/P Corvette) but for street driving that's my guideline.
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Orlando - Where rust must be imported.
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