The 6.3-4-5221-1X yoke is part of the 1760 series, designed for heavy-duty applications. It has a spline count of 44 and a spline diameter of 2.274 inches. The hub diameter measures 3.000 inches, complemented by a through hole diameter of 2.500 inches. With a centerline to end distance of 5.250 inches, this yoke is classified as an HR style and is manufactured by Spicer, ensuring robust performance under demanding conditions.