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#1 |
Registered User
Join Date: Jun 2015
Location: North Idaho
Posts: 99
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Help identifying 12 bolt!
So from any of my searches my stamp on my 12 bolt doesnt have as many numbers as it should. can someone more knowledgeable than me decode this? or point me in the right direction.
This is stamped on the passenger axle tube just like it should be. There was only one number cast into the center section. it was tho lower right if seen from the rear. cant remember the number. it started with a G and ended with 55. ![]() Much appreciated! -Wizit
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Over the top, billet infused, ground up 60 GMC build http://6772chevytrucks.com/vboard/showthread.php?t=809901 |
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#2 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,940
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Re: Help identifying 12 bolt!
What are you trying to find out?
If it is limited slip and what ratio? After 40 years... anything could be in there. Unless you're the original owner of the truck. I'd just pull the cover... Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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#3 |
Registered User
Join Date: Jun 2015
Location: North Idaho
Posts: 99
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Re: Help identifying 12 bolt!
Mostly just what to tell the kid behind the parts counter what vehicle i need parts for.
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Over the top, billet infused, ground up 60 GMC build http://6772chevytrucks.com/vboard/showthread.php?t=809901 |
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#4 |
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![]() Join Date: Apr 2015
Location: Yakima, WA
Posts: 362
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Re: Help identifying 12 bolt!
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#5 | |
Registered User
Join Date: Jun 2015
Location: North Idaho
Posts: 99
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Re: Help identifying 12 bolt!
Quote:
i guess ill keep searching. my axle doesn't match anything in that thread or the countless others ive been through
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Over the top, billet infused, ground up 60 GMC build http://6772chevytrucks.com/vboard/showthread.php?t=809901 |
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#6 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,940
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Re: Help identifying 12 bolt!
If it's a truck 12 bolt... the early ones had 16 spline axles and then the later ones had 30 spline axles. 1971 was when they were widened a tad.
What parts are you looking for? Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
Quote:
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#7 | |
Registered User
Join Date: Jun 2015
Location: North Idaho
Posts: 99
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Re: Help identifying 12 bolt!
Quote:
The diff cover shape is that of a truck axle. Also, it is 6 lug if that helps any.
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Over the top, billet infused, ground up 60 GMC build http://6772chevytrucks.com/vboard/showthread.php?t=809901 |
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#8 |
Registered User
![]() Join Date: May 2013
Location: WEST PALM FLORIDA
Posts: 1,174
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Re: Help identifying 12 bolt!
what year truck , if its a 68 , ha is a 3.73 open axil , the majority had these
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68 Long Fleet , ly6 , turbo 350 , 3-5 drop , original paint , front discs 67 Small window , 7 foot bed , tweaked 6.0 LSX 2004R Medium Olive 58 Apache fleet , 235 , offy intake , dual exhaust , 4 on the floor , red/white 69 Long Fleet , Custom , 6.0, 4l60 , AC , Medium Olive |
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#9 |
Registered User
Join Date: Jun 2015
Location: North Idaho
Posts: 99
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Re: Help identifying 12 bolt!
unfortunately its not from the truck originally. It came with a frame that I bought.
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Over the top, billet infused, ground up 60 GMC build http://6772chevytrucks.com/vboard/showthread.php?t=809901 |
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#10 |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,720
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Re: Help identifying 12 bolt!
Just take the cover off. Looks like you are cleaning and painting the outside (lipstick on a pig?). So go ahead and clean out the inside and add to new seals and fluid including limited slip additive if needed.
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44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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#11 | |
Registered User
Join Date: Jun 2015
Location: North Idaho
Posts: 99
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Re: Help identifying 12 bolt!
Quote:
If I walk into the parts store and tell them I need brakes for a 12 bolt I will get a blank stare.
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Over the top, billet infused, ground up 60 GMC build http://6772chevytrucks.com/vboard/showthread.php?t=809901 |
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#12 |
Registered User
![]() Join Date: Jan 2013
Location: portland oregon
Posts: 156
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Re: Help identifying 12 bolt!
Any luck? Here's a bump for you.
Last edited by jdw; 09-05-2015 at 06:01 PM. Reason: Auto correct |
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#13 |
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![]() Join Date: Jan 2012
Location: Washington,Il
Posts: 632
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Re: Help identifying 12 bolt!
The main difference is axle length and 5/6 lug. As stated above splines. If your painting it. take the time pull the cover/measure the axles and housing.You'll know for sure what you have.
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It builds on my intelligence when I make a mistake, Boy am I building on it! '67 C-10,'70 Nova SS ![]() |
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#14 |
Registered User
![]() Join Date: Mar 2014
Location: jefferson city, mo.
Posts: 6
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Re: Help identifying 12 bolt!
A picture of the complete rear end might help narrow down the year. If it's a 2wd truck, They had 2 different track bar mount designs depending on yearly or late. All of our trucks used the 11"x2" brake shoes. 60-63 were different from the 64-72, but that was it. I understand the frustration with going to get parts at the parts store anymore....If they can't look it up in the computer, they are lost! I worked behind the parts store counter when you looked things up in books!
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#15 |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,720
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Re: Help identifying 12 bolt!
Ring gear will have a date on it if it's original. This is a coil spring truck, correct? They parts should all be the same '66-'72. '63-'65 MAY have some internal differences, I know on the passenger car they first year setup shim pack is different. Can't be any other range than that if a factory coil spring setup.
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44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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