gear ratio and carrier split... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**CMars45000** · 09-19-2006, 03:21 PM

I am having a hard time remembering what the split is between the 2 different carriers used in the Posi 12-bolt. 3.73 and numberically lower is on carrier and 4.11 and numerically higher is the other carrier...Correct?

Thanks

Aarons72s · 09-20-2006, 07:49 AM

Good question. bump

71/454 · 09-20-2006, 04:53 PM

Not sure if this is what you are asking but.. When I called about a posi they ask if it is a 2, 3, or 4 series carrier. The man on the phone explained that the # refers to the gear ratio like you say because the thickness of the ring gear is different on each series. Hope that helps

cowboy33713 · 09-20-2006, 05:52 PM

Howdy:
I'm not the rear end parts whiz, but have seen carriers for our trucks for 3.42 and lower(numberwise), and 3.73 and higher(number wise). By that, a 3.42 and 3.07 would use the same carrier.
If otherwise, someone please say. My own part hunting is based on this!
cowboy33713

Musclerodz · 09-20-2006, 10:25 PM

3.73 is the split I am almost sure. 3.73 will work in either a 3 series or 4 series carrier. They also make spacers to allow you to run 4.10's on a 3 series carrier.

Mike

09-19-2006, 03:21 PM	#1
CMars45000 Registered User Join Date: Jul 2006 Location: Pittsburgh, PA Posts: 204	gear ratio and carrier split... I am having a hard time remembering what the split is between the 2 different carriers used in the Posi 12-bolt. 3.73 and numberically lower is on carrier and 4.11 and numerically higher is the other carrier...Correct? Thanks __________________ Project Family Values Build Thread Vehicles/Projects: -1971 C10 SWB Fleetside! Gathering parts now, will begin frame-off resto soon... Pleasure in the job puts perfection in the work. -Aristotle

09-20-2006, 07:49 AM	#2
Aarons72s Registered User Join Date: Apr 2006 Location: oklahoma Posts: 10,669	Re: gear ratio and carrier split... Good question. bump

09-20-2006, 04:53 PM	#3
71/454 Turbo Guy Join Date: Jan 2005 Location: Calgary Alberta Posts: 353	Re: gear ratio and carrier split... Not sure if this is what you are asking but.. When I called about a posi they ask if it is a 2, 3, or 4 series carrier. The man on the phone explained that the # refers to the gear ratio like you say because the thickness of the ring gear is different on each series. Hope that helps __________________ 1972 Gmc Custom swb intercooled twin turbo 327 10.5-1 and 12 lbs of boost, Nodular iron case super t-10 4 speed with a blowproof bellhousing, 12 bolt eaton posi soon to have moser axles. 1998 Honda CR250 fully ported, case matched, milled head, vortexed carb and revalved suspension but don't forget the woody woodpecker decal kit! Things I've broken so far: 12 bolt diff saginaw 4 spd many, many pieces Aluminum case Super t-10 4 spd

09-20-2006, 05:52 PM	#4
cowboy33713 Senior Member Join Date: Apr 2005 Location: metro Phoenix, AZ Posts: 241	Re: gear ratio and carrier split... Howdy: I'm not the rear end parts whiz, but have seen carriers for our trucks for 3.42 and lower(numberwise), and 3.73 and higher(number wise). By that, a 3.42 and 3.07 would use the same carrier. If otherwise, someone please say. My own part hunting is based on this! cowboy33713

09-20-2006, 10:25 PM	#5
Musclerodz Senior Member Join Date: Aug 2005 Location: OKC, OK Posts: 2,364	Re: gear ratio and carrier split... 3.73 is the split I am almost sure. 3.73 will work in either a 3 series or 4 series carrier. They also make spacers to allow you to run 4.10's on a 3 series carrier. Mike __________________ Mike Redpath

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