IF I understand this query correctly, then I would suggest you use the Astro input shaft and simply change the clutch disc. I would suggest you talk to Astro because I believe (hope I'm right here) that the astro input shaft is a 26 spline, 1 1/16" shaft, which is a GM shaft...isn't it?). So I don't think this will work. BTW, I've got the G-force gear-set, and it is the above set-up, which I think is identical to the Astro stuff (or close to it).