Small block to big block trans cross member doesn't work after swap?

There are at least four types of 727 2wd tails. 1....The "flange drive" rear tail used in passenger cars through 64, 2......the standard long shaft used in light trucks and all passenger cars 65 and after, 3, the "short shaft" tail used in some motor homes, and 4, the type(s) used with a drum brake emergency brake installed on the rear of the tail housing

586584-becc00caf2e7a581702c9e1c733aa724.jpg

IMAGE062.jpg