[Sheepdip]

Originally Posted by '68OrangeSunshine

Unfortunately, some people didn't appreciate the 'svelte' look of the stepside bed and wasted little time converting them to the kind of truck they liked.
C = 'Conventional' or 2wd
E = Eight [V8]
1 = 1/2 ton
04 = Cab and Stepside, er, "Fenderside" in GMC
- = GMC-only code space for Pennsylvania special equipment. "-" means NO PA
1 = 1971
Z = Fremont Calif. Plant
56303 = Sequence number of that truck, starting from 10000.

I know this is an older post but I was reading thru some of these old threads and now I'm curious as to what "GMC-only code space for Pennsylvania equipment" means? Was this possibly smog equipment? Can anyone enlighten me?