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Old 03-07-2011, 12:23 AM   #1
john rod
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posi rear info request

a friend just got a complete leaf spring rear axle [i have a coil spring rear] with a posi [ratio unknown].
i would like to have a posi in my '67 C-10 panel. i have a 3.73. how many different series posi units are there? what are the ratio ranges of each. point is if this were to be a 3.08 [or whatever is the close #] would the 3.73 work. same for a 4.10.

thanks rod in AZ

Last edited by VA72C10; 03-07-2011 at 10:39 AM. Reason: You must be a subscriber to post wiw, wtb, ads...
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Old 03-07-2011, 10:40 AM   #2
VA72C10
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Re: posi rear info request

I cannot remember at the moment for sure, but I think the carrier stopped at 373 and the next picked up at 410....

....moved to the correct forum so hopefully someone knowing more about pumpkins can help
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Old 03-07-2011, 07:53 PM   #3
ont_guy_38
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Re: posi rear info request

if it is a 10 bolt , they are 2.73 and up to like 5 something but 12 bolt is like 3.08-3.42 ....3.73 and up
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Old 03-07-2011, 09:13 PM   #4
crazy longhorn
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Re: posi rear info request

12 bolt truck goes , 2.76-3.42 on a 3 series carrier....3.73 & lower(higher numerical numbers), are on a 4 series carrier. You can get an aftermarket (thick ring gear), to run a 3.73/4.10/4.56 gear on a 3 series carrier.... crazyL
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