[mean81GT]

you ever sit at a light, and put your left foot on the brake, and your right foot on the gas? well, when you do that with a stock torque converter, the engine will rev to about 1800 rpm. even if you floored it, it will still only rev to 1800 rpm. in a mustang, when you floor it, of course it is going to spin the tires, and rev higher. but if you had 20 horsepower in the car, and you couldn't spin, it will only rev to 1800. the higher stall aftermarket torque converter puts the engine into the powerband quicker, by allowing the engine to rev free (to a point) of the tranny. so do they work? absolutely. but the higher is not the better in most cases. in a street driven car, a 2400 will suffice. i have seen full on drag cars with 6500 rpm stall torque converters. hope this helps.