Mainshaft GearAyman Kunna Trading1663748C91

The Mainshaft Gear (Part No. 1663-748-C91 / 1663748C91) is a precision-engineered transmission gear designed for heavy-duty truck applications. It serves as the 4th gear on the main shaft, ensuring smooth power transfer and reliable operation within the manual transmission system. Manufactured from high-strength alloy steel and heat-treated for durability, this gear provides excellent resistance to wear, torque stress, and high operating loads. It is commonly used as a direct replacement for OEM gears in Navistar and International truck transmissions, delivering dependable performance and long service life.