wayne , its not that its designed not to lock , there is a delay due to its design. it will lock , but it happens at about 1000ft . mine always locks when i have the tc saver disconnected .
i think at the point iot does lockup we are high enough in RPms that the torque is on the downside , torque is the enemy of the dodge TC clutch ... besides , with a DTT tc , lockup is not that big a deal ...