My understanding is that the 54 & 55 cab was redesigned to remove the peak, thus enabling the use of a single, flat piece of glass for the windshield.
As far as modifying the 47-53 cab for a one piece windshield, the bare minimum would be cutting out the divider bar. I'm not sure if anything else would be necessary.
-Tim
'51 Chevy 3104 w/'56 235, 848 Head, HEI Dizzy, Corvette Cam, Split Manifold and Dual Carter YF's
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