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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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