Thank you for your question, Muataz. In order to connect a block with speed outputs to a block with torque inputs, you need to add a compliance element in between them. Powertrain Blockset provides such blocks in our library, e.g., the Torsional Compliance block. You can see how we’ve used such blocks in our reference applications. For example, open up the conventional vehicle reference application, then navigate down to the driveline in “SiCiPtReferenceApplication/Passenger Car/Drivetrain (SiDrivetrain)”. Note how there’s a compliance block that connect the Dual Clutch Transmission to the Differential.
For your specific question, I've attached a screenshot of how you could connect a torque converter to a transmission block. Hope that helps,
Mike
