I am working on a vehicle powertrain model that includes a torque converter and an automatic transmission. I am planning to use powertrain toolbox to develop the system, however, I have a question regarding the inputs and the outputs of the subsystems provided with the toolbox. The torque converters' inputs are the impeller torque and turbine torque and its outputs are impeller speed and turbine speed. Theoretically, torque converter models take impeller torque and speed (from the engine) to predict the turbine torque and speed. Then, the outputs are connected to a transmission however the later has inputs of gear, engine torque, and differential torque, and outputs engine speed and Diff speed. So I am not sure how to establish a connection between the torque converter and the automatic transmissions?