13601-28021 13602-28020 Balance Shaft Assembly For Solara Matrix TC 2AZ-FE 2AZ-FXE 2.4L 4CYL Engine Parts The 13601-28021 and 13602-28020 balance shaft assembly is designed for use with select vehicle models equipped with the 2AZ-FE and 2AZ-FXE 2.4L 4-cylinder engines.This assembly helps reduce engine vibration, contributing to smoother and improved driving experience.Constructed with metal components, it supports function under normal operating conditions.This unit serves as a direct replacement for the part, allowing integration into the existing engine system without modifications.It is suitable for installation in compatible Solara, Matrix, TC, and models.The design allows for straightforward mounting using standard tools, making it accessible for both professional technicians and experienced DIY users.Engineered for compatibility with the specified engine types, this balance shaft assembly supports consistent performance and long-term functionality as part of the engine's internal system.