HELP! I need info on what series my 10 bolt posi is! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**1774btcrew** · 10-01-2014, 05:34 PM

I have been doing a ton of research on these carriers. I have a customer that wants to purchase this from me but I want to verify that it will work for him. I went to this website: http://www.nastyz28.com/forum/archiv...p/t-17931.html and it says that a 3 series carrier will hold 2.73 and numerically higher gears(3.08, 3.42, 3.73 and into the 4s) 2 series holds 2.56 and numerically smaller. Is this correct? I have 2two 10 bolt posi 8.5 carriers. One has 2.56 gears and one has 2.73. Most of the information I have found on other sites says nastyZ28.com has the right info. I have a friend that sells a lot of carriers to a rear end shop and he says all that matters if they are cast with a 6 or an 8 . He says the 8s are 3 series and the 6 or 9 depending on how you look at it are 2 series. I need some definitive info as this will be shipped and I don't want an unhappy customer. I would appreciate any info you guys can give me.

**1774btcrew** · 10-01-2014, 06:29 PM

The info that I found on Nastyz28.com was correct. I got my own answer by pulling the ring gears off and standing them side by side for comparison. 3 series is on the right, 2 series is on the left.

Caleb · 10-02-2014, 12:33 PM

dont quote me but im pretty sure the GM 8.5 10 bolt only has 2 carrier breaks. 2.56/2.73. i have this axle in the front on my truck and its all the same internals. so one you would need a new carrier to run any higher and the other just needs a ring and pinion to rock and roll.

10-01-2014, 05:34 PM	#1
1774btcrew Senior Member Join Date: Jun 2009 Location: Phoenix AZ Posts: 4,602	HELP! I need info on what series my 10 bolt posi is! I have been doing a ton of research on these carriers. I have a customer that wants to purchase this from me but I want to verify that it will work for him. I went to this website: http://www.nastyz28.com/forum/archiv...p/t-17931.html and it says that a 3 series carrier will hold 2.73 and numerically higher gears(3.08, 3.42, 3.73 and into the 4s) 2 series holds 2.56 and numerically smaller. Is this correct? I have 2two 10 bolt posi 8.5 carriers. One has 2.56 gears and one has 2.73. Most of the information I have found on other sites says nastyZ28.com has the right info. I have a friend that sells a lot of carriers to a rear end shop and he says all that matters if they are cast with a 6 or an 8 . He says the 8s are 3 series and the 6 or 9 depending on how you look at it are 2 series. I need some definitive info as this will be shipped and I don't want an unhappy customer. I would appreciate any info you guys can give me. __________________ AZPartsLocators on Instagram 1972 Cheyenne Super Short Bed big block "Blackie" 1977 Crew Cab GMC Short bed with 4BT Intercooled Cummins Diesel and a 4L80e "The Junkyard Dog" 1985 Crew Cab Chevy dually with 5.9 Cummins "The Big Dog" This is what my dad liked to be called by the grandkids before he passed so it seems fitting for his old truck.

10-01-2014, 06:29 PM	#2
1774btcrew Senior Member Join Date: Jun 2009 Location: Phoenix AZ Posts: 4,602	Re: HELP! I need info on what series my 10 bolt posi is! The info that I found on Nastyz28.com was correct. I got my own answer by pulling the ring gears off and standing them side by side for comparison. 3 series is on the right, 2 series is on the left. __________________ AZPartsLocators on Instagram 1972 Cheyenne Super Short Bed big block "Blackie" 1977 Crew Cab GMC Short bed with 4BT Intercooled Cummins Diesel and a 4L80e "The Junkyard Dog" 1985 Crew Cab Chevy dually with 5.9 Cummins "The Big Dog" This is what my dad liked to be called by the grandkids before he passed so it seems fitting for his old truck.

10-02-2014, 12:33 PM	#3
Caleb Registered User Join Date: Jul 2014 Location: Castle Rock, Colorado Posts: 49	Re: HELP! I need info on what series my 10 bolt posi is! dont quote me but im pretty sure the GM 8.5 10 bolt only has 2 carrier breaks. 2.56/2.73. i have this axle in the front on my truck and its all the same internals. so one you would need a new carrier to run any higher and the other just needs a ring and pinion to rock and roll.



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