what years of 12 bolt will fit - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Thealien · 10-02-2010, 05:23 PM

I would like to get a 12 bolt housing for my 4X4 72 Jimmy that I can powdercoat and rebuild over the winter. What years will work?

Thanks
Mark

turp mcspray · 10-02-2010, 06:57 PM

According to the interchange book...72 chevy/gmc truck and 72 blazer/jimmy. One year only. I'm not sure what the difference is between other years. 1970 and up use the same length axle shaft, so it must be some thing minor like a brake issue or something. I think the book considers something to be interchangeable, as something that doesn't require a single bolt to be changed.

msgross · 10-02-2010, 08:04 PM

I put a 2WD 12 bolt in my truck and it's a little wider than stock, better than the narrow original...

I think that you can make about anything work from solide axle chevy's. 2WD's will require that you weld on spring perches but that's easy... www.diy4x.com

Thealien · 10-02-2010, 09:45 PM

Thanks both of you. In my situation welding on spring perches would not be an option as I am trying to have it powdercoated and rebuilt ready for installation to decrease down time. I had my Jimmy tied up for 6 months plus with the 5.3 swap and I would like to be able to swap axles in a weekend.

So anybody have a 72 4X4 12 bolt housing hanging around?

raycow · 10-03-2010, 01:59 AM

I believe the difference is the routing of the brake hard lines and the location of the tee. To use the "wrong" year housing you have to relocate the tee or the hose.

Ray

msgross · 10-03-2010, 08:42 AM

I basically gave my old axle away because I didn't want to store it, sorry... I picked up a 3.73 posi 12-bolt at the Junkyard for $35....

Thealien · 10-03-2010, 09:56 AM

I have 4-5 local junk yards 5 miles from my house. They have nothing for these old trucks

larry may · 10-03-2010, 04:01 PM

I bought a 12 bolt posi from Kingsolver. It fit with no issue's other than as one mentioned above the brake t and the lines were a bit different. MY HEAP IS A 68 the unit from Kingsolver I believe was a 70 or 71. Not sure now. it was as one mentioned above a little bit wideran inch or two.

10-02-2010, 05:23 PM	#1
Thealien Senior Member Join Date: Jun 2007 Location: Pine Ridge Florida Posts: 4,123	what years of 12 bolt will fit I would like to get a 12 bolt housing for my 4X4 72 Jimmy that I can powdercoat and rebuild over the winter. What years will work? Thanks Mark __________________ Click on my Not really a build thread, yet NOT SO RUST FREE RUST FREE BLAZER LS ENGINE SWAP INFORMATION THREAD BOLT RESTORATIONS 4l60 to an NP205

10-02-2010, 06:57 PM	#2
turp mcspray Registered User Join Date: May 2007 Location: Rapid City South Dakota Posts: 2,359	Re: what years of 12 bolt will fit According to the interchange book...72 chevy/gmc truck and 72 blazer/jimmy. One year only. I'm not sure what the difference is between other years. 1970 and up use the same length axle shaft, so it must be some thing minor like a brake issue or something. I think the book considers something to be interchangeable, as something that doesn't require a single bolt to be changed. __________________ Turp Mcspray New life for an old 2wd, farm blazer http://67-72chevytrucks.com/vboard/s...d.php?t=505987 My Blazer build http://67-72chevytrucks.com/vboard/s...d.php?t=342299

10-02-2010, 08:04 PM	#3
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: what years of 12 bolt will fit I put a 2WD 12 bolt in my truck and it's a little wider than stock, better than the narrow original... I think that you can make about anything work from solide axle chevy's. 2WD's will require that you weld on spring perches but that's easy... www.diy4x.com __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer"

10-02-2010, 09:45 PM	#4
Thealien Senior Member Join Date: Jun 2007 Location: Pine Ridge Florida Posts: 4,123	Re: what years of 12 bolt will fit Thanks both of you. In my situation welding on spring perches would not be an option as I am trying to have it powdercoated and rebuilt ready for installation to decrease down time. I had my Jimmy tied up for 6 months plus with the 5.3 swap and I would like to be able to swap axles in a weekend. So anybody have a 72 4X4 12 bolt housing hanging around? __________________ Click on my Not really a build thread, yet NOT SO RUST FREE RUST FREE BLAZER LS ENGINE SWAP INFORMATION THREAD BOLT RESTORATIONS 4l60 to an NP205

10-03-2010, 01:59 AM	#5
raycow Registered User Join Date: Mar 2003 Location: San Francisco, CA USA Posts: 2,454	Re: what years of 12 bolt will fit I believe the difference is the routing of the brake hard lines and the location of the tee. To use the "wrong" year housing you have to relocate the tee or the hose. Ray

10-03-2010, 08:42 AM	#6
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: what years of 12 bolt will fit I basically gave my old axle away because I didn't want to store it, sorry... I picked up a 3.73 posi 12-bolt at the Junkyard for $35.... __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer"

10-03-2010, 09:56 AM	#7
Thealien Senior Member Join Date: Jun 2007 Location: Pine Ridge Florida Posts: 4,123	Re: what years of 12 bolt will fit I have 4-5 local junk yards 5 miles from my house. They have nothing for these old trucks __________________ Click on my Not really a build thread, yet NOT SO RUST FREE RUST FREE BLAZER LS ENGINE SWAP INFORMATION THREAD BOLT RESTORATIONS 4l60 to an NP205

10-03-2010, 04:01 PM	#8
larry may Senior Member Join Date: Jul 2005 Location: MISSOURI Posts: 3,256	Re: what years of 12 bolt will fit I bought a 12 bolt posi from Kingsolver. It fit with no issue's other than as one mentioned above the brake t and the lines were a bit different. MY HEAP IS A 68 the unit from Kingsolver I believe was a 70 or 71. Not sure now. it was as one mentioned above a little bit wideran inch or two. __________________ The biggest problem people have, is other people Thou shalt be cool and not hassle Be a site supporter. The heart of the wise inclines to the right, but the heart of the fool inclines to the left." Ecclesiastes 10:2



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