The Stovebolt Site Forums The Shop Area Paint and Body Shop Picture of 53 1/2 ton frame

Coach-

I'm not aware of any specific markings that would distinguish it among the AD years. There are suspension and drivetrain features that would distinguish a 1/2 ton from heavier duty applications.

Although not a pic of a full frame, take a look at my frame donor photos and compare. Note that these include some post-graft photos, so the Nova rear end will not resemble your own drivetrain. Another source might be Tom Brownell's book How to Restore Your Chevrolet Pickup. Good luck!