MS WTT: 3 series posi for 4 series posi-12 bolt - The 1947 - Present Chevrolet & GMC Truck Message Board Network

usmcchevy · 01-17-2011, 12:56 PM

** I purchased a 4 series and will be creating a for sale thread for my 3 series posi**

I have a 3 series factory Eaton posi that I would like to trade for a 4 series posi. Just the carrier, I don't have the complete rear.

FYI: 3 series = 2.76 to 3.42 factory gears
4 series = 3.73 and numerically higher

Cyclone44 · 01-17-2011, 01:31 PM

Is there a easy way to tell them apart?

usmcchevy · 01-17-2011, 01:55 PM

Casting number. Mine is 32212. Not sure what a 4 series number is but post up what you have and I can do some research.

darthwall · 01-17-2011, 03:09 PM

im not sure but can't you use shims on the 3 series to use the 373's

usmcchevy · 01-17-2011, 03:46 PM

Quote:

Originally Posted by darthwall

im not sure but can't you use shims on the 3 series to use the 373's

Don't know, but I am going to try to only swap the carrier and keep my gears like what is being talked about here. So I really should have a 4 series.

http://67-72chevytrucks.com/vboard/s...d.php?t=439159

Cyclone44 · 01-18-2011, 12:44 PM

I will check to see what mine is!

usmcchevy · 01-18-2011, 03:26 PM

Quote:

Originally Posted by Cyclone44

I will check to see what mine is!

Awesome!

Cyclone44 · 01-18-2011, 09:13 PM

The #'s on mine.... 30080 316 8 23 C Not sure what they mean but those are all the numbers I see on it!

usmcchevy · 01-18-2011, 09:30 PM

Sure that 8 isn't a 6? Looks like 30060 is the series 4 that I need. Here is my series 3.

Cyclone44 · 01-18-2011, 09:37 PM

It is 30060 my eyes are tired!!...lol

usmcchevy · 01-18-2011, 09:55 PM

Quote:

Originally Posted by Cyclone44

It is 30060 my eyes are tired!!...lol

Sweet, wanna trade then? PM me your terms, I'm open to whatever

Cyclone44 · 01-18-2011, 10:02 PM

I was told that a 308 gear would work fine on mine!

usmcchevy · 01-18-2011, 11:01 PM

I ran searches on this site and on google. Everything I can find points to 32212 being series 3 and 30060 being series 4.

All I KNOW is that a 32212 carrier is what they put 3.07's on at the factory. I just took a 3.07 ring gear off this one and the posi with 3.07 gears I sold a month ago was a 32212.

I'll call around tomorrow to see if I can verify any of this info

lol

usmcchevy · 01-19-2011, 01:37 PM

I called Randy's ring and pinon 1-866-631-0196. They couldn't do anything with casting numbers, but told me how to measure.
With the carrier sitting on its end or the bearing on a flat level surface measure to where the ring gear mounts.

1.709 = 2.76-3.42
1.996 = 3.73+

This makes mine a 2.76-3.42

I asked about putting a 3.07 gear on a 3.73+ carrier and was told it was not recommended to try.

Cyclone44 · 01-19-2011, 02:29 PM

My carrier is just under 2 inches!

usmcchevy · 01-19-2011, 04:33 PM

Quote:

Originally Posted by Cyclone44

My carrier is just under 2 inches!

PM sent!

usmcchevy · 01-20-2011, 10:34 PM

I purchased a 4 series and will be crating a for sale thread for my 3 series posi

mrk818 · 01-24-2011, 11:46 PM

I have a 4 series for sale if someone needs one ?

thanks

lynnfield · 01-25-2011, 07:44 AM

What would you be asking for the 3 series?

usmcchevy · 01-25-2011, 08:14 AM

Sorry, sold already.

http://67-72chevytrucks.com/vboard/s...d.php?t=442070

01-17-2011, 12:56 PM	#1
usmcchevy Has more rust than truck... Join Date: Apr 2005 Location: Ivanhoe, MN Posts: 2,421	WTT: 3 series posi for 4 series posi-12 bolt I purchased a 4 series and will be creating a for sale thread for my 3 series posi I have a 3 series factory Eaton posi that I would like to trade for a 4 series posi. Just the carrier, I don't have the complete rear. FYI: 3 series = 2.76 to 3.42 factory gears 4 series = 3.73 and numerically higher __________________ 1972 Custom/10 SWB, 4.8/4l80e Build thread LSx Swap FAQ index Last edited by usmcchevy; 01-21-2011 at 05:28 PM. Reason: Found one

01-17-2011, 01:31 PM	#2
Cyclone44 Step Brother Join Date: Sep 2007 Location: K-town Posts: 4,029	Re: WTT: 3 series posi for 4 series posi-12 bolt Is there a easy way to tell them apart?

01-17-2011, 01:55 PM	#3
usmcchevy Has more rust than truck... Join Date: Apr 2005 Location: Ivanhoe, MN Posts: 2,421	Re: WTT: 3 series posi for 4 series posi-12 bolt Casting number. Mine is 32212. Not sure what a 4 series number is but post up what you have and I can do some research. __________________ 1972 Custom/10 SWB, 4.8/4l80e Build thread LSx Swap FAQ index

01-17-2011, 03:09 PM	#4
darthwall Registered User Join Date: Mar 2010 Location: washington Posts: 274	Re: WTT: 3 series posi for 4 series posi-12 bolt im not sure but can't you use shims on the 3 series to use the 373's

01-18-2011, 12:44 PM	#6
Cyclone44 Step Brother Join Date: Sep 2007 Location: K-town Posts: 4,029	Re: WTT: 3 series posi for 4 series posi-12 bolt I will check to see what mine is!

01-18-2011, 09:13 PM	#8
Cyclone44 Step Brother Join Date: Sep 2007 Location: K-town Posts: 4,029	Re: WTT: 3 series posi for 4 series posi-12 bolt The #'s on mine.... 30080 316 8 23 C Not sure what they mean but those are all the numbers I see on it!

01-18-2011, 09:30 PM	#9
usmcchevy Has more rust than truck... Join Date: Apr 2005 Location: Ivanhoe, MN Posts: 2,421	Re: WTT: 3 series posi for 4 series posi-12 bolt Sure that 8 isn't a 6? Looks like 30060 is the series 4 that I need. Here is my series 3. __________________ 1972 Custom/10 SWB, 4.8/4l80e Build thread LSx Swap FAQ index

01-18-2011, 09:37 PM	#10
Cyclone44 Step Brother Join Date: Sep 2007 Location: K-town Posts: 4,029	Re: WTT: 3 series posi for 4 series posi-12 bolt It is 30060 my eyes are tired!!...lol

01-18-2011, 10:02 PM	#12
Cyclone44 Step Brother Join Date: Sep 2007 Location: K-town Posts: 4,029	Re: WTT: 3 series posi for 4 series posi-12 bolt I was told that a 308 gear would work fine on mine!

01-18-2011, 11:01 PM	#13
usmcchevy Has more rust than truck... Join Date: Apr 2005 Location: Ivanhoe, MN Posts: 2,421	Re: WTT: 3 series posi for 4 series posi-12 bolt I ran searches on this site and on google. Everything I can find points to 32212 being series 3 and 30060 being series 4. All I KNOW is that a 32212 carrier is what they put 3.07's on at the factory. I just took a 3.07 ring gear off this one and the posi with 3.07 gears I sold a month ago was a 32212. I'll call around tomorrow to see if I can verify any of this info lol __________________ 1972 Custom/10 SWB, 4.8/4l80e Build thread LSx Swap FAQ index

01-19-2011, 01:37 PM	#14
usmcchevy Has more rust than truck... Join Date: Apr 2005 Location: Ivanhoe, MN Posts: 2,421	Re: WTT: 3 series posi for 4 series posi-12 bolt I called Randy's ring and pinon 1-866-631-0196. They couldn't do anything with casting numbers, but told me how to measure. With the carrier sitting on its end or the bearing on a flat level surface measure to where the ring gear mounts. 1.709 = 2.76-3.42 1.996 = 3.73+ This makes mine a 2.76-3.42 I asked about putting a 3.07 gear on a 3.73+ carrier and was told it was not recommended to try. __________________ 1972 Custom/10 SWB, 4.8/4l80e Build thread LSx Swap FAQ index Last edited by usmcchevy; 01-19-2011 at 01:39 PM.

01-19-2011, 02:29 PM	#15
Cyclone44 Step Brother Join Date: Sep 2007 Location: K-town Posts: 4,029	Re: WTT: 3 series posi for 4 series posi-12 bolt My carrier is just under 2 inches!

01-20-2011, 10:34 PM	#17
usmcchevy Has more rust than truck... Join Date: Apr 2005 Location: Ivanhoe, MN Posts: 2,421	Re: WTT: 3 series posi for 4 series posi-12 bolt I purchased a 4 series and will be crating a for sale thread for my 3 series posi __________________ 1972 Custom/10 SWB, 4.8/4l80e Build thread LSx Swap FAQ index Last edited by usmcchevy; 01-21-2011 at 05:29 PM. Reason: update

01-24-2011, 11:46 PM	#18
mrk818 Registered User Join Date: Jan 2011 Location: albq Posts: 6	Re: WTT: 3 series posi for 4 series posi-12 bolt I have a 4 series for sale if someone needs one ? thanks

01-25-2011, 07:44 AM	#19
lynnfield The Waco Kid Join Date: Oct 2009 Location: Waco, TX. Posts: 1,781	Re: WTT: 3 series posi for 4 series posi-12 bolt What would you be asking for the 3 series?



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01-25-2011, 08:14 AM	#20
usmcchevy Has more rust than truck... Join Date: Apr 2005 Location: Ivanhoe, MN Posts: 2,421	Re: WTT: 3 series posi for 4 series posi-12 bolt Sorry, sold already. http://67-72chevytrucks.com/vboard/s...d.php?t=442070 __________________ 1972 Custom/10 SWB, 4.8/4l80e Build thread LSx Swap FAQ index

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