[pjmoreland]

700R4 transmissions from 1989-93, I believe, had a temperature switch that would close if the transmission overheated, causing the torque converter clutch to be locked in 4th gear regardless of the state of the vacuum or speed sensors and the logic of the ECM. The way I have wired my TCC has rendered the temperature switch ineffective. Here's another way the TCC could be wired that would have all of the same behavior of my current harness, but it would also allow the temperature sensor to work as GM intended.