Ya John, I know what u are referring to. If u look at the earlier latches, on the back side of the "handle" that u pull forward to release the latch, there is a hook which grabs a bar. That hook is the early version of the secondary latch and it functions to keep the hood from flying open if the primary latch releases. It is easy to overlook it because it is automatically released by the forward pulling action that releases the main latch.
Plastic trucks suck...
Iron trucks rule...