Why didn’t I Think of that instead of going the easy way out and just buying a bolt on Astro shaft for about the same price I could’ve gotten a knuckle and just welded it on what the hell was I thinking Thanks for the help that’s a great ideaDon't be sorry about asking. I have a Chrysler style Borgeson box so I had to get a knucle to fit the box and Astro shaft. The bottom of the Astero shaft is a 1" DD in case you need to modify the Astro shaft to fit.. Looking at your set up perhaps you can cut the shaft behind the rag joint and get a knuckle to fit the shaft and the spline.