Quoted from Rod and Custom Mag: "a torque converter is like a clutch. Imagine when a clutch is fully released, and you get all the power from the engine. That's stall speed. A 2,500 stall speed doesn't mean you need to rev the motor to 2,500 rpm for the vehicle to move." What it does mean in this case is 2,500 rpm is the limit at which the converter will hold back the engine speed if transmission output is prohibited. By disallowing further gain, the increase in engine rpm "stalls." The speed at which stall occurs with a given converter is a function of engine-peak torque."Also some more info on this swap: http://www.y-blocksforever.com/forums/Topic7429-3-1.aspx