TQ Lockup

[EmmerichLSx]

This happened to me once and it turned out really bad. The place that built my trans didn't replace two very important solenoids. There's a pressure solenoid and a Pressure Control Manifold. One controls pressure and one controls where it goes (apparently). The pressure solenoid is the round one, under the pan, right by the accumulator that you can see, and the PCM (pressure control manifold) is the flat one that is bolted to the valve body. If one or both of those are gunked up inside your trans won't pressure up and the converter won't stay locked.