Chrysler's A-Body (Unibody) Changes 1967-76
This is correct
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
Wheelbase difference between different models
And many, many other running changes through the years...
This is right and some other changes were:
Inner fenders in the '67 to '73 cars were the same other than some screw holes, but the right side changed in '73 to '76 cars to accommodate a charcoal canister which left a inward bulge on the newer cars and the '67 to '72 cars had a smoother appearance.
The roofs were slightly different in the inner structure because of the upgrade to a cardboard head liner instead of the mounting for bows in the previous years as well as some better seat belt mounting brackets for shoulder belts in the newer cars.
In '75 and '76 cars, the floor was raised on the driver's side near the transmission hump to make room for a catalytic converter if so equipped, but all of the cars got this modification.
Speaking of emissions stuff, some of the cars from '71 and up had several different configurations of holes and or block off plates in the upper passenger side of the cowl just above the fire wall, and some got none at all.
And, starting in '72, the side marker lights were plastic lenses that stuck out from the exterior sheet metal instead of being recessed in to be flush or mostly flush. the '67 cars didn't have side marker lights at all, and the '69 cars looked like they had a light, but it was only a reflector.
1972 was kind of a transition year where they had some of the '73 and up features, but retained some of the '71 features.
On '70 to '71 Dusters and '71 Demons, the trunk lid was smooth without a rib in the middle, and the late '71 cars and newer had the rib.
Starting in late '71 models, and up to '76. the bumpers had slotted jack holes and the jacks had a stub like finger sticking out to fit in the slot instead of a bracket that fit under the bumper in previous years.
And for sure the cars post '72 had a different trunk lock hole and locking assembly.
Of course , the tail light assemblies and tail light mounting structures were different over many of the years as were tail panels and shape of the rear quarter panels as well.
Starting in '73, the doors had side impact beams in them making them a lot heavier (on the 2 doors at least).
And the K-Members in '73 and up cars were called spool mount K-Members and were different from the earlier puck mount engine mounts and the same goes for the transmission mount.
There were several other differences over the years and some were dependent on the factory that they were built in and where the cars were to be shipped, but this covers most of the differences that I know of, but I'm not 100% sure of the '72 model year cars, I've only had 2 of them over the years. They are kind of their own animal.........
