The 5504-01 is a pinion yoke from the 1550 series, specifically designed for the Dana 80 differential. It features a spline count of 37 and a spline diameter of 1.609 inches, with a hub diameter of 2.500 inches and a through hole measuring 2.000 inches. The center-to-end distance is 4.406 inches. This yoke requires the Dana strap kit 3-70-38X for installation. It is compatible with various applications, including the 1 Ton Dodge Pickup from 1994 to 2001 (rear), the 1 Ton GM Pickup from 1992 to 2001 (rear), the 3/4 Ton Dodge Pickup from 1993 to 2006 (rear), and the Ford F350 from 1988 to 2004 (rear).