Originally Posted by
druggr
But the later change only had minor style and feature changes. A generation change is much more then that. For example take a 1955 Chev Belair and a 1957 Belair. The 55 had no rear fins, but the 57 did. The 57 did not represent a generation change. For the Belair, the next generation change occurred in 1959 with a completely new frame, trim, accessories, and body style.
Minor changes takes a handful of engineers. A generation changes requires teams of many.