B-body 83/4 into a A-body

Hey OP, does this axle have the 741 carrier? If so, have you pulled the '65 B rear axle apart to look at the gears? Just be aware that there was an odd ball 8-1/4" R&P installed in the 741 carrier in '62-'65 in 225/6 B body cars. If it is a 489 or 742 carrier, then no worries on this point.