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Old 01-27-2020, 11:42 PM   #1
Greg Reimer 7376
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Cool 12 bolt gears

I'm about to put together a rear end for a friend, it will be a 12 bolt positraction thing for the street, but all we have are 4 series posi units. Does anybody make a 3.73 or so gear for the 12 bolt that fits the 4 series unit? We're very aware of the 4 series gear sets that have a very thick ring gear to be used with a 3 series carrier, but we are going the other way, with a 3.73 or a 3.90 gear set.
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Old 01-28-2020, 01:48 AM   #2
Dyno
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Default Re: 12 bolt gears

Richmond makes them, or at least used to.
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Old 01-28-2020, 09:38 AM   #3
Danny Ashley
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Default Re: 12 bolt gears

US Gear # 01-888373-4 Put these in my Chevelle. I've installed three sets of US Gears and have been very happy with them. Only ring & pinions made in the USA.
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Old 01-28-2020, 10:27 AM   #4
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Default Re: 12 bolt gears

I think I have a 3.90 at home that only has a couple of passes.
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