8 3/4 rear end.

perfacar said
while back i seen a chart that showed rear end widths, the 62 to 63 8 3/4 housing for the b body, is same width as the a body housing, i have one, and measured it, the measure the same, width, the a body axles will bolt up easily, i moved the spring pads in 1/2 inch per side to fit a body springs. i use the a body 10 " by 1 3/4 brakes

The chart i believe (a stickie in the drivetrain forum here) says the 62/63 b-body 8 3/4 is almost 1 1/2 wider than an A-body 8 3/4, and almost two inches wider than an a-body 7 1/4. (Drum face to drum face). And of course the spring pads are in a different location.