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Originally Posted by phantoms
Trans in gear without car moving is where it usually makes most of it's heat, but under certain load conditions, some slippage may occur at speed and also build heat.
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Not a lot of horsepower being produced with the engine idling in gear.
Much more heat produced on the highway where the horsepower really comes into play. The difference between engine speed and transmission speed is typically 200 rpm on level ground. Head up a grade and this increases to over 300 rpm. We're talking a lot of heat...............