Whatever the generation and the model year, Step-Van⁽¹⁾ has been written with an hyphen by Chevrolet:


The GMC Value Van never had this attention

(1971 / 1975 brochures)
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1: Strict name search (modelMatch=2) gives 557 vehicles, while a "contains" search (modelMatch=0) provides 558 answers. If I'm not mistaken, there's no possibility to search only in the complement field with the search page, so I can't say which vehicle has it written that way.