HELP! What series is my posi unit? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**1774btcrew** · 04-20-2014, 11:59 AM

This is a gov lock 12 bolt posi unit with 3.08 gears. I know a lot of people aren't fans of these and I am not looking for comments on how good or not good they are. I have just been doing a lot of searching and can't get a definitive answer on what gears will fit. I think it will fit up to 3.42 but am not sure. This isn't the answer I am hoping for as I really want 3.73 gears. Any positive input would be appreciated.

ont_guy_38 · 04-20-2014, 07:04 PM

Yes, 3:42, but there are a few manufacturers that make thick gears for a series 3 carrier.

andrewmp6 · 04-21-2014, 07:30 AM

http://www.summitracing.com/parts/rmg-4900721/overview/ http://www.summitracing.com/parts/mg...373x/overview/

motornut · 04-21-2014, 10:26 AM

Quote:

Originally Posted by andrewmp6

http://www.summitracing.com/parts/rmg-4900721/overview/ http://www.summitracing.com/parts/mg...373x/overview/

good to know thanks

Quote:

Originally Posted by 1774btcrew

This is a gov lock 12 bolt posi unit with 3.08 gears. I know a lot of people aren't fans of these and I am not looking for comments on how good or not good they are. I have just been doing a lot of searching and can't get a definitive answer on what gears will fit. I think it will fit up to 3.42 but am not sure. This isn't the answer I am hoping for as I really want 3.73 gears. Any positive input would be appreciated.

I've got one marked as 3.40 in my 4X2-79....not sure what the my others gears are.

**1774btcrew** · 04-21-2014, 10:57 AM

Thanks for all of the input. These are the answers I was looking for!

04-20-2014, 11:59 AM	#1
1774btcrew Senior Member Join Date: Jun 2009 Location: Phoenix AZ Posts: 4,557	HELP! What series is my posi unit? This is a gov lock 12 bolt posi unit with 3.08 gears. I know a lot of people aren't fans of these and I am not looking for comments on how good or not good they are. I have just been doing a lot of searching and can't get a definitive answer on what gears will fit. I think it will fit up to 3.42 but am not sure. This isn't the answer I am hoping for as I really want 3.73 gears. Any positive input would be appreciated. __________________ 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.

04-20-2014, 07:04 PM	#2
ont_guy_38 Registered User Join Date: Jul 2007 Location: Ontario Canada Posts: 1,006	Re: HELP! What series is my posi unit? Yes, 3:42, but there are a few manufacturers that make thick gears for a series 3 carrier. __________________ 1985 C10 2004 Avalanche

04-21-2014, 07:30 AM	#3
andrewmp6 Registered User Join Date: Jan 2009 Location: Louisville,Ky Posts: 5,811	Re: HELP! What series is my posi unit? http://www.summitracing.com/parts/rmg-4900721/overview/ http://www.summitracing.com/parts/mg...373x/overview/

04-21-2014, 10:57 AM	#5
1774btcrew Senior Member Join Date: Jun 2009 Location: Phoenix AZ Posts: 4,557	Re: HELP! What series is my posi unit? Thanks for all of the input. These are the answers I was looking for! __________________ 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.

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