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12 Bolt Carrier Help

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Old Feb 5, 2016 | 10:46 AM
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Default 12 Bolt Carrier Help

I bought a Moser 12 bolt with 3.90 gears and 33 spline axles. I want to spool it but I can't determine which series carrier it is. Everything I found says a 4 is 4.10 gears and higher, 3 is supposed to be 3.73 and lower. Then I find you can buy 3.90 gear set for a 3 or 4. The whole rear is for a 93-97 f-body and was ordered as a package from what I'm told by previous owner. How can I tell for sure which series carrier it is? I emailed Moser but they said it's probably a series 3 but not sure.
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Old Feb 20, 2016 | 11:06 AM
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do you know if that diff will work in a strange 12 bolt? If so I have a spool and I want a diff
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Old Feb 20, 2016 | 11:33 AM
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Originally Posted by Mystery Bird
I bought a Moser 12 bolt with 3.90 gears and 33 spline axles. I want to spool it but I can't determine which series carrier it is. Everything I found says a 4 is 4.10 gears and higher, 3 is supposed to be 3.73 and lower. Then I find you can buy 3.90 gear set for a 3 or 4. The whole rear is for a 93-97 f-body and was ordered as a package from what I'm told by previous owner. How can I tell for sure which series carrier it is? I emailed Moser but they said it's probably a series 3 but not sure.
Post up the numbers from the edge of the ring gear please.

Carl
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Old Feb 22, 2016 | 07:42 AM
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Originally Posted by Carl at CRP
Post up the numbers from the edge of the ring gear please.

Carl
Alright, will try and snap a pic of that tonight.
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Old Feb 22, 2016 | 01:00 PM
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If I could guess its a 3 series and they are pretty common but the gear model number will tell for sure.
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Old Feb 22, 2016 | 05:26 PM
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Originally Posted by Mystery Bird
Alright, will try and snap a pic of that tonight.
Looks like it's a 3.


Last edited by Mystery Bird; Feb 22, 2016 at 05:31 PM.
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Old Feb 22, 2016 | 05:40 PM
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That number is a US Gear 3.91 gearset.
The US gear catalog references a Richmond 49-0040-1 as same
Richmond Gear catalog states that 49-0040-1 as for a 3 series carrier.
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Old Feb 23, 2016 | 06:33 AM
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Thanks everyone for you help.
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