Thank you for having a look. It does not look like it is broken. It does look like the two piece one shown on page 4 of the instruction that I linked. Something about mine, and the one in the instruction, is different.
1950 GMC 100 Panel Truck, 1958 270, 3-spd Saginaw with BW OD, 3.73 12 Bolt Differential from a 1966 C10, Front Disc Brakes Bought it in pieces 9-1976, driving since 6-1978 Follow in the DITY | 
