Chrysler's A-Body (Unibody) Changes 1967-76

Professor Fate said

LOTS of variations along the way:
Early ones had a smaller radiator opening, later ('73-'76) were opened up for a 26" rad.
A/C and non-A/C firewalls were different
LOTS of variations in dash frames
Minor differences in front/rear frame rails to accomodate impact bumpers
Floor pans modified in later years to accomodate catalytic converters
Torque plates added in hipo and convertibles
And many, many other running changes through the years...

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And the firewalls were different 67-72 than 73-76, although that was just heater layout type stuff (holes in different spots)

The passenger side inner fender changed too, it got a recess to clear the charcoal canister when that was added.

73-76 cars had the option of a 26” radiator, but if they came with a 22” radiator the radiator support opening was still only 22”. Cars with 26” radiators had a larger opening.

Also, that original list contains both the 111” and 108” wheel base cars. Darts and Scamps were 111”. Barracudas, Dusters, Demons and Dart Sport were 108”, and the early Valiants were 108” as well. Frame rails, crossmembers etc on all of those are the same, the difference is in the rear floor pan and rockers.

Most of the big changes occurred in ‘73 with the redesign.