[Formulajones]

Originally Posted by grandam1979

Lots of times I think most 68-72 A body shafts I have seen have the step.

Yes I see it often on a-bodies. My Chevelle factory shaft is tapered. Interesting theory on why but the fact that my original Z driveshaft is not tapered and uses a similar size joint tells me the taper wasn't necessary. Doesn't make sense. I guess it remains a mystery.
Biggest difference in joints is how they are retained. 3r in the Chevelle and 1330 in the Camaro. Similar in size but one retained with injected plastic (replaced with snap rings) while the other does not.