The McCormick 398330R4 pinion is a genuine OEM component designed for various McCormick MC series agricultural tractors, including models MC80, MC90, MC95, MC100, MC105, MC110, MC115, MC120, MC130, and MC135. This essential part ensures efficient and reliable power transmission within the machine's drivetrain system, maintaining optimal performance and durability. Sourced from verified OEM catalogs and authorized distributors, this pinion is built to McCormick's original specifications for perfect fit and function.