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Yes, you're right, I was generally talking about 14 bolt rearends in these body styles. I'm not sure when the changeover year was, but I had a '87 dually pickup with a 14 bolt, and the one under my '67 C-30 came out of a '97 C3500.
The later dually pickups used 14 bolts instead a Dana 70. That's what I have under my '67 C-30. There are 3 different width 14 bolt FF rears - SRW, cab and chassis dually, and Dually pickup/short bus.