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Re: Johns 66
The casting numbers on the caps won't tell anything about the differential. If you are certain of the tooth count then you have 3.42 gears. Those are not original. If the tooth count was 11 & 41, then that is a 3.73 gear ratio and could very likely be original. On the edge of the ring gear where it is bolted to the carrier are the part number, date and tooth count stamped into the ring gear.
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