1410 FINE SPL SLIP YOKE ASSY

It’s the splined component that slides onto a transmission or transfer case output shaft, allowing the driveshaft to change length as the suspension moves. You would replace it when the original yoke develops slop, the splines wear, or the U-joint bore is damaged. It uses a Spicer 1410 series universal joint, which is a common size in medium and heavy-duty truck applications.