Your taking about a Torque Converter. Think of it as a rubberband. The motor will spin faster (winding up the rubberband) and the torque converter will multiply the force to the tranny (leting go of the rubberband). This helps you get rolling from a dead stop. When your talking about a stall, that is the RPM that the torque converter will start applying force to the tranny. The stock mustangs have about a 800 stall. So at 800RPM's, the motor will give the tranny the power. If you had an 3000 stall, the car won't get it's power until the motor reaches 3000RPM. The car will still move just a little bit, but won't launch hard. My friend has a drag car that makes over 900HP at the wheels and he is running a 2500 stall. Keep this in mind, if you get a 3000 stall and your crusing down the freeway at 2000 RPM's, your tranny will get very HOT because it's "slipping".
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