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mcca5773 · 09-12-2022, 11:34 AM

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?

09-12-2022, 11:34 AM	#15
mcca5773 Registered User Join Date: May 2019 Location: Eagle River, AK Posts: 27	Re: 1967 GMC RPO Codes 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?