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For 68-9 A bodies with an 8 3/4 rear (i.e., not slant six):

The optional 3.55 and 3.91 gears were only available with Sure Grip.

With the standard 3.23 gears, automatic or 4/speed, Sure Grip was optional.

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For 68-9 A bodies with an 8 3/4 rear (i.e., not slant six):

The optional 3.55 and 3.91 gears were only available with Sure Grip.

With the standard 3.23 gears, automatic or 4/speed, Sure Grip was optional.

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A bodies were not alone , this was standard across the board , except for maybe the multiple carb cars ???

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Well, I was trying to limit my answer to what I know. But for 68-69 performance cars at least, I'd guess you're right. For earlier years, I think lower (higher numerically) gears were offered w/o Sure Grip. Especially in 7 1/4 rear cars (like a 64-6 V-8 A body).

For non-performance 68-9 cars, I'm not so sure. My literature shows you could get a 318 Charger in 69 with a 3.55 open rear. Wouldn't that have had an 8 3/4 rear?

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Well, I was trying to limit my answer to what I know.

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I knew I was threading on thin ice