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Re: SPID code questions-
This isn't going to be entirely satisfactory, but here goes:
a) What is 77D vs 77W?
Ans: The "D" and the "W" are extra codes that don't have a ton of significance. The primary tracking is done by the "LEE1" quick spec (for Burg Cloth in a Silverado) vs "CEE1" (Burgandy Vinyl in a Scottsdale). So they are primary a "cloth vs vinyl" difference, not a model year thing.
b) What does the "DUA" stand for?
Ans: Short for "Dual tone cloth/vinyl woven trim" - which would be a bit much to put on a SPID
c) Why does it have GMC verbiage on the SPID if it's a Chevy?
Ans: I don't know. I've seen it go the other way - often - because that's really all a GMC truck is: It's a Chevy with RPO Z88. But - I don't think I've seen GMC verbiage on a Chevy SPID nor would I ever expect to. It's sort of a moot point anyway, since Z62 is the designation for mid-level trim regardless of the marketing nameplate.
d) What do the additional codes "OCR-E999-G003" mean?
Ans: I don't know on that one, either. Nothing is jumping out at me, so it must not be terribly significant.
K
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