"Early A" doesn't cut it
Well, see, if we get into the mechanical and electrical systems, I would say the next big divider after 67 would be '70 and insome ways '75 and particularly '76 are one offs. On the other hand not many '76 A-bodies made, so maybe we banish them to For F Bodies Only forum.
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Well,
aaaaaaaactually, we'd have to have a divide between '67 and '68 (steering linkage, steering column, side marker lights, head restraints, shoulder belts, crankshaft counterbore/torque converter nose diameter, speedometer cable and drive pinion…). We'd have to take account of the difference between '70 and '71 taillights and head restraints and gas caps, and '71 was also the first year for NOx emissions control equipment in California, so that's another split…and the '72 NOx emissions system was completely different, plus charcoal can instead of crankcase for fuel vapour storage, and surface-mount side markers, so there's ample justification for a '71/'72 split, too. Don't even
get me started on '73; they need their own subforum. Could probably get away with '74-'75 together in one subforum, but we'd hafta be sneaky about it, because in '75 some cars started coming with
catalytic converters, so shhh. And '76, well! I mean, shunt-type ammeter; need I say more? I think not. But it's a problem, because then what do you do with the foreign-market '77-'82 A-bodies? The ones in Brazil and Argentina and Australia? That's six years times three markets equals 18 additional subforums we're gonna need. And you can't really expect people to put up with lumping the green cars in with the yellow ones or the red ones or the blue ones, or the 2-doors with the 4-doors, or the ones with and without the optional glovebox and ashtray lights (I think mixing those is in the Bible in the thou-shalt-not section).
So really, we oughtta be thankful to mister, soon-to-be-livin'-the-rest-of-his-shortaѕѕ-duration-at-fabo-in-agonizing-ignoredness, sealion over here for showing us the way.