The truck in the photo:
Are you calling that an '84 C30?
Because -
1 - it's got a later front end on it (like 89-91).
2 - looks like manual locking hubs sticking out the front wheel caps which would make it a K30.
In either case I'm thinking it's had some work done which does not make me optimistic that it's a factory color for the original model year.
K
Nice Truck!!!!
I agree with Keith,
May be a Frankentruck, lots of them out there due to interchangeability over the years, not a bad thing . The grill/headlights and fender badging indicate a later model as Keith mentioned and the mirrors are not (I believe) normal for duallys, most duallys had the towing mirrors. Those look to be regular pickup mirrors (I think, anyone else feel free to chip in, skip the blah blah blah about could have changed doors.... duh).
Bottom line, send us a pic of the SPID from the glove compartment, WITH VIN, and we can tell you what that decodes to and it left the factory as.
Butch