Simply, and Factually put, transmission Temps OVER 200 degrees shorten the life of an automatic transmission. Not in years, in miles. Better fluids may help, but the soft parts just can't handle the heat forever, IN A CAR..
Also, most trucks that use a HD transmission have a Transmission Temperature gauge..
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"The Future Belongs to those who are STILL Willing to get their Hands Dirty" .. my Grandfather
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