8.25 big and little differential?

The 8 1/4" used two carriers. One will only work with a 2.45 ratio ring gear and the other one is good for 2.76 and up. The ring gear mounting flange on the 2.45 carrier is too thick to accept any other ratio, a function of pinion gear diameter. I suppose it could be machined to standard flange thickness, but it would be more cost effective to source another carrier.