In post 2 there is attached pictures.
The pic on the left is a homokinetic axle. It has similar "cans" on each end. There is a single bolt hole down the center of the wheel hub end and the differential end is held by a "C" clip.
The picture to the right shows an annular axle at the differential end. It has bolts attaching it to a flange. If your axle boots are ripped the annular axle is the easiest one to replace the boots on.
http://www.peachparts.com/shopforum/diesel-discussion/338716-half-shaft-removal-83-300sd.html