series 2 or 3 rear end? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chevybill · 03-06-2005, 10:55 AM

I want to order a posi traction unit of the 70 c 10 half ton 2wd.
In looking at the information-- they always want to know if it is a series 2 or series 3 carrier. What doe this mean. I know I have a 12 bolt rear end with a 3.73 gear in the rear and I know it is the original rear end for the truck.

Wat does the carrier refer to half ton or three quarter ton?

Any thoughts on this appreciated. What brand of posi unit does the board members recommend? I have looked at Eaton and detroit locker are there others? What vendor do you recommend for the best price?

Thanks for all the replies.

69 longhorn · 03-06-2005, 12:56 PM

the factory 12 bolt(1/2 ton ), runs a 4 series carrier for 3.73 & numerically higher gears (4.10, 4.56, ect). 3.07 & 3.42 are on a 3 series carrier. 69L

chevybill · 03-06-2005, 08:42 PM

thank you 69 longhorn, i am very surprised not to get any more responses with 43 views.

again, thanks for the help

farside847 · 03-07-2005, 01:38 PM

Has anyone ever made a FAQ on how to change your trucks rear end?

ehjorten · 03-07-2005, 01:44 PM

IMHO I would purchase an Eaton Posi unit. I personally don't like the Auburn units, as they are not rebuildable. Although I recently saw that Auburn is touting a rebuildable unit now, but I thinkg you have to send it back to Auburn Gear. I wouldn't get a locker for your 2wd C10.

Dual quad · 03-07-2005, 08:52 PM

As the series number increases, the flange on the carrier where the ring gear bolts to gets thicker (thus the ring gear is pushed closer to the pinion). The reason for increased flange dimension is to make up for the decrease in pinion gear diameter that occurs as the overall numeric ratio increases. For example, a 3.07 pinion gear has a much larger diamter than a 4.10:1 pinion gear. If ordering after market gears, you can get a special 3.73 or 4.10 (normally series 4 carrier) thick gearset to work with a 3 series carrier.

03-06-2005, 10:55 AM	#1
chevybill Senior Member Join Date: Oct 2004 Location: calhoun city ms Posts: 940	series 2 or 3 rear end? I want to order a posi traction unit of the 70 c 10 half ton 2wd. In looking at the information-- they always want to know if it is a series 2 or series 3 carrier. What doe this mean. I know I have a 12 bolt rear end with a 3.73 gear in the rear and I know it is the original rear end for the truck. Wat does the carrier refer to half ton or three quarter ton? Any thoughts on this appreciated. What brand of posi unit does the board members recommend? I have looked at Eaton and detroit locker are there others? What vendor do you recommend for the best price? Thanks for all the replies. __________________ ongoing 1970 c 10 lwb 1994 z-28 few mods.-owned since new 1978 vette silver/grey 25th anniv. paint

03-06-2005, 12:56 PM	#2
69 longhorn Registered User Join Date: Aug 2001 Location: rock island,il,usa Posts: 5,382	the factory 12 bolt(1/2 ton ), runs a 4 series carrier for 3.73 & numerically higher gears (4.10, 4.56, ect). 3.07 & 3.42 are on a 3 series carrier. 69L __________________ http://community.webshots.com/user/hotrodhorn

03-06-2005, 08:42 PM	#3
chevybill Senior Member Join Date: Oct 2004 Location: calhoun city ms Posts: 940	thank you 69 longhorn, i am very surprised not to get any more responses with 43 views. again, thanks for the help __________________ ongoing 1970 c 10 lwb 1994 z-28 few mods.-owned since new 1978 vette silver/grey 25th anniv. paint

03-07-2005, 01:38 PM	#4
farside847 Registered User Join Date: Feb 2005 Location: Bay Area, California Posts: 995	Has anyone ever made a FAQ on how to change your trucks rear end? __________________ 1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree

03-07-2005, 01:44 PM	#5
ehjorten Registered User Join Date: Jan 2001 Location: Kirkland, WA, U.S.A. Posts: 32	IMHO I would purchase an Eaton Posi unit. I personally don't like the Auburn units, as they are not rebuildable. Although I recently saw that Auburn is touting a rebuildable unit now, but I thinkg you have to send it back to Auburn Gear. I wouldn't get a locker for your 2wd C10. __________________ '68 Chevy Stepside in Frame-up Restoration process. 292 CID Clifford Performance Modified T56 6-speed Tranny Slammed, Custom IFS and IRS Money?...Too Much!

03-07-2005, 08:52 PM	#6
Dual quad Smell that burnin' rubber Join Date: Sep 2000 Location: Ontario Posts: 171	As the series number increases, the flange on the carrier where the ring gear bolts to gets thicker (thus the ring gear is pushed closer to the pinion). The reason for increased flange dimension is to make up for the decrease in pinion gear diameter that occurs as the overall numeric ratio increases. For example, a 3.07 pinion gear has a much larger diamter than a 4.10:1 pinion gear. If ordering after market gears, you can get a special 3.73 or 4.10 (normally series 4 carrier) thick gearset to work with a 3 series carrier.



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