Quote:
Originally Posted by DavidG
"Show Me",
I can't speak to commercial frames or those after the 1937, but the frame rails under my '37 cabriolet are thicker than those on '37 closed car frames. That's stamped into the side rails and confirmed with calipers.
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Dave, As usual, you are correct.
I can only attest with confidence in regard to the '39 - '40 cars.
Both the '39 and '40 convertible frames had thicker outer frame rails than their closed car "cousins". They were a nominal .010" thicker.
I doubt the associated costs to make these rails was very substantial. I am fairly certain distinct forming dies were required for the respective rails (closed or open car) but no doubt the same stamping dies were utilized for both.