JA is the wheel ID code.
-Big letter JA or big letter JC were stamped through '67 production up into mid May of '68 when small letter wheel ID codes & external date codes began. The big letter code can be stamped left or right of the valve stem.
-The JK stamped next to the wheel size on the spine of the wheel is the ASAE code for the design of the outer wheel (hoop) design. This will be either JJ or JK for a steel wheel.
Useage:
JA (big letter) '67-68 A-body w disc brakes
JA (small letter & external dates):
very late '68 model A-body disc useage, as well as ALL '69 A-body w drum OR disc brakes.
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