Maybe this is well-known stuff, but I share it anyhow. Looking at 1974 ChryCo cars produced at the Newark Assembly, I noticed a sharp division between C bodies and A bodies: PH41K4F122500 Fury [SPD A16, MDH 102022] PP43M4F123015 Fury PP23M4F125877 Fury PP43M4F125933 Fury PP43M4F128891 Fury DH23N4F132133 Monaco [SPD B08] PH41M4F138478 Fury PH41M4F141135 Fury [SPD B15, MDH 112820] DH41M4F143716 Monaco DH41M4F144940 Monaco DP43M4F148094 Monaco [SPD B21] DH41M4F149528 Monaco [SPD C06] PH41K4F158253 Fury LH23C4F169339 Dart VH23C4F173965 Scamp [MDH 022014] VH23G4F174840 Scamp [MDH 021923] LH41G4F178209 Dart LH23C4F195277 Dart LH23G4F195425 Dart LH23C4F195473 Dart LH23C4F199728 Dart [MDH 040821] LH23C4F203197 Dart LH23G4F203282 Dart [MDH 041111] VH23C4F215864 Scamp VH23C4F218457 Scamp VL41C4F220352 Valiant VL41C4F229737 Valiant It looks like a) the six last digits in the VIN are linked to an assembly rather than to a car line and b) the Newark assembly retooled for A bodies somewhere between December 6, 1973 and February 19, 1974. I'd welcome examples that would narrow the gap between December and February. Counter examples to this whole idea are also welcome, of course. PS. I added some Newark-produced Monacos, just to drive my point home.