**Due to printing tolerances the part may not be a drop in fit to the differential case. Always test fit before starting the build. Recommended to spin the part in a drill and polish/sand the shaft and outdrive diameters. The dogbone slot can be prepped with a thin file on the slot walls or using the face of a rotary disc. The inner cavity for the dogbones can be prepped with a rotary grinding bit in a circular motion. Verify the pin hole is ~2mm and the pin can be inserted easily.