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Cool find! BTW-

I don't think the 8 3/4 used the sure grip tag after a certain year. I believe they gave them up in favor of color codes on the bottom of the carrier. I know my original '69 Swinger with 489 cased, 3.91 Sure Grip only has the ratio tag.

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Yes, they used tags until at least '71.

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I worked on my buddies survivor '70 RR ragtop, 383 4-spd with 3.23 sure grip over the weekend and like my '69 Swinger, it just had the ratio tag. My '69 is a Hamtramck car and the RR is a St. Louis car. I have a few more cars to look into that are untouched (both of my Dana cars have the Limited Slip and ratio tags, as well as the '63 Savoy). I'm very curious now