The Torque Converter in your Automatic Transmission equipped Mustang is basically a fluid operated Clutch. It transfers all that Engine power to the Transmission. Because of all the different applications & operating conditions, no one Torque Converter can satisfy every Mustang owners needs. With differences in Stall Speed, size, durability options, & Lockup or Non-lockup types there is a lot to consider! Don't worry though, we have you covered with many out of the box & custom options for your C4, AOD, AOD-E, 4R70W, & 5R55S. For a more in depth look at Torque Converter construction & operation, take a look at Wikipedia's Torque Converter page.