I appreciate your knowledge. After looking closer, those wheels are the BBP of 4.5. I thought all the A bodies switched over to the BBP and larger ball joints in '73. If I'm wrong, I apologize for passing on bad info. I had a '73 /6 Duster in high school, and it was BBP steelies and single piston discs. I had A/C and a few other options, so maybe that had something to do woth it. Again, I'm not calling you out, just trying to add to my old brain's hard drive.
No problem. I thought they all switched to BBP in 1973 as well till I saw my first SBP 1974 one and it was a strippo slanty 4 wheel drum car. I dunno if the intent was to use up extra inventory on the assembly line, or a different reason.
