Mystery Bird

iTrader: (7)

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.

phoenix rises

iTrader: (3)

do you know if that diff will work in a strange 12 bolt? If so I have a spool and I want a diff

Carl at CRP

iTrader: (9)

Post up the numbers from the edge of the ring gear please.

Carl

Mystery Bird

iTrader: (7)

Alright, will try and snap a pic of that tonight.

01ssreda4

iTrader: (96)

If I could guess its a 3 series and they are pretty common but the gear model number will tell for sure.

Mystery Bird

iTrader: (7)

Looks like it's a 3.

FirstYrLS1Z

iTrader: (4)

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.

Mystery Bird

iTrader: (7)

Thanks everyone for you help.