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Lock up the TC and you cut the flow of ATF to the cooler. Heat builds up and expensive and often spectacular (a trail of parts and fluid scattered down the road) transmission failures follow.
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Is this true on all automatics? Some of the newer ones must have fixed that issue because they now lock up the majority of the time. (obviously not mine)
I would imagine that since most of the heat generated by the transmission is generated by the inefficiency of the unlocked TC that over heating from a locked TC is a non issue. But since TCs normally lock at highway speeds, I guess all that wind does the trick, cooling it from the outside. Doesn't this essentially turn the auto into a manual (which cools passively) in terms of heat generation? Where is all this heat being generated?
Would it be prudent to install a temp gauge in the tranny to make sure? Most of my trips are too short to cause that much heating.
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Face it: The automatic was never intended for hypermiling. The manual transmission is far superior.
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I totally agree. I hate them. But since I'm stuck with slushbox, a ten minute mod to reduce the losses sure beats installing a manual transmission in my Previa
IF I could even find one.
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