1950 ford truck issues
Cargo Master
Joined: Feb 2008
Posts: 2,795
Likes: 129
From: Windermere Valley,B.C. Ca
From kevinstangs (more then you ever wanted to know about 9 inch diffs) site;
http://www.kevinstang.com/Ninecase.htm
A method to identify 28 spline axle shafts can be by looking at the center brake hub area, a rectangular slot in the center will indicate 28 spline axles.The 31 spline axle shafts will have a different appearance, with one small center chamfer and two outer holes in the center hub, however, 28 spline shafts can also appear like this to, so it does not always indicate 31 spline shafts.
http://www.kevinstang.com/Ninecase.htm
