I'm pretty sure the 7 speed is inside the transmission. Have to drop the pan, then remove the Valve body. I believe that if you replace this part, it needs to be carefully mapped via Xentry . You may also need to copy current specs from your TCU via Zentry before replacement. If you go this far, be sure to check / consider replacing the speed sensors, as they are a known failure point.
You might contact Module Repair Pro, 5911 Lemona Ave, Van Nuys, CA 91411. THey did the repair for my sped sensors, as well as the ABC controller repair. I believe they are familiar with the TCU's as well. 1-818-235-1095