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The Power Transfer Unit (PTU) provides full time, part-time or on-demand All-Wheel-Drive (AWD) torque distribution for Front-Wheel-Drive (FWD) based AWD systems. FWD has advantage in drivetrain efficiency and fuel economy, while AWD improves traction to have better acceleration and handling. Part-time and on-demand AWD have all the benefits of AWD and the efficiency of FWD. So AWD vehicle option continues to be popular around the world. However, Noise, vibration and Harshness (NVH) error state called PTU rattle has been detected in FWD mode of AWD systems due to torsional excitation. This study is one of the first to be focused on the PTU gear rattle as a NVH error state so far. We developed an AMESim-ADAMS co-simulation model for understanding PTU gear rattle phenomenon through drivetrain torsional responses (i.e. rotational degree of freedom, DOF) in system and PTU rattle assessment through PTU case vibration.