Quote:
Originally Posted by mcca5773
Thanks for filling in the gaps. It makes perfect sense. What I'm seeing is that the numbers evolved as the production line advanced. 04 or any other early 1967 number for GMC would be the Freemont Plant. Later in the year they dropped off the 0 and in the successive years dropped off the plant number altogether.
I think you're onto something in going from a 5 to a 3 digit code and the part number correlation. The 1967 suburban above had a Z61RH for the Custom Appearance and pickup a Z61DG. You think that might have been in 1969-1970 when GMC and Chevy started to standardize their products more?
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Yes - by 1973 Chevrolet and GMC were the same.
X88 = Chevrolet Nameplate identification
Z88 = GMC Nameplate Identification.
So - a GMC was a Chevy with RPO Z88 (or vice versa, depending on your preference).
K