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If the trans was acting up when cold & straightened out when hot or if I became convinced that cold fluid was shortening its life over the long run but if using the rad cooler for the heat benefit is the way to go I will go with that as you are the man
I cannot think of one OEM manufacturer that agrees with your theory. But you know best.
You do not want a cold transmission, you want a transmission with a stable temperature of 175 to 200 degrees. Too cold or too hot are both bad.
The factory service manual for my 92 D250 says the overdrive will not engage until the transmission has reached a specified temperature.
That tells me they don't want the transmission too cool.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
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