I'm wondering if the 700R4 has been modified? I've worked with a few 700R4's that had some internal wiring modifications done to allow a manual toggle switch to lock up the torque converter.

What I remember about OBD I 700R4 TCC control ... when the 4th gear switch closes a ground is sent to the ECM. The TCC solenoid gets power from the brake switch. When all programmed parameters are qualified (usually TPS / MPH), the ECM will apply a ground to the TCC solenoid.

I'm thinking EFI Live can be programmed to 100% PWM Min / Max for TCC control. I'm thinking MPH can be programmed for TCC lock up. I'm thinking most LS1B wiring I've worked with have Red 42 as TCC control.

dave w