The ever-increasing focus on user experience has made minimizing gearbox NVH (Noise, Vibration, and Harshness) a critical requirement. Plastic gears hold significant potential in addressing the NVH challenges of modern gearboxes. Replacing a steel gear pair with a steel/plastic or plastic/plastic combination offers an effective and straightforward way to achieve substantial noise and vibration reduction. Selecting the appropriate material pairing is crucial for maximizing these benefits. Different plastic material combinations exhibit varying NVH performance, making it essential to choose the right pairing for the specific application. In this study, seven different material combinations for drive and driven gears were evaluated for gear NVH performance. The reference combination of steel/steel was compared against steel/plastic and plastic/plastic combinations to assess their relative performance.