I have an 8.2 rear in my GP. It's from a 67 Chevelle, the 64 to 67 is 2.5" wider than a G body rear and the 68 to 72 Chevelle is 4.5" wider than the G body rear. I have UMI conversion uppers and UMI lowers with a Roto Joint on the axle side.
you may have the RPO code but with a 30 year old car I always like to check cause who knows if the rear end gears were changed, plus I think it's a good idea to change the rear end oil since we don't know how old or what type of oil is in the rear end
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