Converter stall speed is the RPM at which slippage lessens and more power is transmitted to the transmission.
Truck usually have a "loose" convertor, or one whose stall speed is too high over the peak torque RPM. Replacing it with a "tighter" converter, one whose stall speed is closer to the peak torque RPM, will cause less slippage and more power transfer. The old Cummins trucks like mine, the peak torque is around 1800, but the convertors don't stall til around 2000 RPM, so I have 2000 RPM in my powerband that really doesn't do anything because the converter is slipping too much in that RPM range.
Highly modified sled pullers, like drag racers, want a high-stall converter so that they can get the RPM up into the powerband while still stopped.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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