[Jacques Reed]

Attached from the Ford Manual is a picture of the cross section of a Rzeppa joint.

To test with the rod in the hole a small screw plug has to be removed first at the outer end of the joint. These are often butchered by curious Bubba because the slot is very shallow, and the screw is very tight. If that happens it will be difficult to remove in the field. I had two that were like that.

The rod actually bottoms out on the plunger for the centering pin which keeps the axis of the balls and cage always at half the angle between the centerline of the joint and the centerline of the axle shaft from the diff.

Cheers,