If you get a spare moment, can you post a pic of the backside of your ring gear? Attached is a better image from the G-508 TM of just the ring gear. The area near the edge to accommodate the thrust block is clearly visible.
Also, just for reference, attached is an image of a Timken pinon gear. After looking at it, I think that it is safe to say that this gearset will not work in a Studebaker US6. Although, I'm not sure there were any other Studebaker products made that could have used the Chevrolet designed axle.
Best Regards...
Last edited by CrowbarBob; 03/14/20237:51 AM. Reason: Typo