Thanks to Rob and David - I went and dug out some of the stash of blueprints I received from Alex Blair's collection to look at their numbering. One drawing in particular caught my eye...
Drawing number C-321587 originally issued on paper marked as the Army Engineering Design Branch, crossed out and stamped as the Directorate Of Vehicle Development, Q.M. G. Branch, Dept. of National Defence has a reference to GM part 5820086 and depicts a "Flange-Transmission-Drive-Shaft". This drawing is dated 5-2-47.
Definite proof that the format of "C-######" was used to number drawings within the AEDB and QMG Branch, including automotive parts.
A very quick check in several CMP and GM armoured vehicle manuals didn't find 5820086. Hopefully someone else will have better luck finding the application of GM part 5820086...
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