Will be at the 52 GMC truck again this weekend to tinker around with it some more..
I still have not been able to locate that distributor gear drive...
Summit racing was recommended by a fellow car guy... they came up with nothing.

The shaft diameter measures.491” with calipers
It has 13 teeth and is 1.150” long.

Will try to post a picture on here.

If anyone has any ideas where I might find one, please chime in.
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1952 GMC model 473 dump truck
1951 Chevy 1500 stepside