In fact, many retrofit hot rod 700-R4s are delivered without a functional torque converter clutch (TCC) lockup circuit ... of the relay to engage the TCC solenoid. The relay is there to protect ...

A lock-up torque converter clutch is controlled by a solenoid that directs hydraulic pressure to the clutch when it receives an electronic signal from the Powertrain Control Module. The clutch ...

The lone solenoid in black (black arrow) is the torque converter clutch engagement solenoid. If you’re having shift control or converter engagement issues this is one of the places you should ...