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I recently purchased an 8.75 rear out of a '66 Charger. However, it is a 489. From what I can find, these started production in '69. Since it was in (fit) the '66, I'm assuming this must have originally been in a '69 or '70 B-body. Is that right?

I'm almost positive your correct on the 489 cases being introduce into the production cars in mid 1969

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)