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Using Chevrolet as the baseline, we all know of the famous tri-year models in 1955-57. 1958 was a one-year only body style and the 1959-60 models started the low and wide styling cue. As far as I can tell, Buick, Pontiac and Oldsmobile followed the same suit. But, Cadillac was a bit different. Not sure about the differences in Cadillac’s 1950-53 line up because these cars aren’t quite as interesting to me. But, Cadillac’s tri-year period was 1954-1956. The 1957 Cadillac represented a model change which carried over to 1958. Then, for 1959-60, Cadillac fell in line with the rest of the GM family.
So, here’s my question. Did the 1954-56 Cadillac’s use the same platform as the tri-year (55-57) Chevy’s? Given it was clearly GM’s flagship line, Cadillac tended to get the new innovations first. Then, said innovations would trickle down to the rest of the GM family the following years. Having said that, it would also appear Cadillac again got a one year jump in 1957 – with the rest of the GM family having to wait until 1958 for this body style.
Here’s another way to look at it. Comparing a ’57 Chevy to a ’57 Buick/Olds/Pontiac is pretty much an apples-to-apples comparison (aside from engine differences). But, comparing a ’57 Chevy to a ’57 Cadillac is like comparing an apple to an orange. Correct?