Many Ford 8.8 axle pinions use a flange to mate to the driveshaft, instead of a yoke. Some variations exist in flanges across the axle model years. If you’re swapping axles, it’s fairly easy to find the adapter pieces to convert from one to another or employ a driveshaft shop to modify whatever mating ends are needed. 1310 (early years) and 1330 series joints are fairly common with these axles. Aftermarket yokes can also bump the joint size up to the heavy-duty 1350 series.