This is a Double Cardan Joint, which is essentially two u-joints mounted to an intermediate center yoke. Using this style joint at the transmission lets you rotate the axle pinion so that the rear u-joint in the driveshaft is at zero degrees (a straight line through the driveshaft and pinion shaft).
This is a Double Cardan Joint, which is essentially two u-joints mounted to an intermediate center yoke. Using this style joint at the transmission lets you rotate the axle pinion so that the rear u-joint in the driveshaft is at zero degrees (a straight line through the driveshaft and pinion shaft).