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10-19-2010, 03:20 PM
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#1 |
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Registered User
Join Date: Sep 2009
Location: franklin, TN
Posts: 80
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How do I know this is the right posi unit?
I got this with a 69 truck, the guy telling me it was for a 12 bolt. Not long ago though someone was telling me that they had two different 12 bolts for the cars and the trucks and that the diffs were different. So how do I figure out if this will work in my 77 with a 12 bolt?
    thanks for any info you guys can provide. -Webb |
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10-19-2010, 06:53 PM
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#2 | ||
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just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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Re: How do I know this is the right posi unit?
Quote:
6erWebb, unfortunately I can't help you ID the one in the pic, but I can add to the confusion. Even if you do identify this carrier as one fitting a truck, you still need to determine it's gear "series". The flange where the ring gear mounts is at a different height depending upon what ratio "series" it was made for. So you need to know what gear ratio you have (or desire to change to) before you will be able to determine whether or not this one will work.
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Bad planning on your part does not necessarily constitute an instant emergency on my part.... The great thing about being a pessimist is that you are either pleasantly surprised or right. 
Last edited by LONGHAIR; 10-19-2010 at 06:55 PM. |
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10-19-2010, 08:31 PM
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#3 |
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Robert Olson Transport
 
Join Date: Oct 2002
Location: recent transplant to NC USA
Posts: 20,281
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Re: How do I know this is the right posi unit?
im thinking this may be better served in the drivetrain section where more rear end experts go
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Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!! |
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10-19-2010, 10:02 PM
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#4 |
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Registered User
Join Date: Feb 2003
Location: Bertrand, Nebraska
Posts: 355
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Re: How do I know this is the right posi unit?
No that one is from an 8.75 car axle used in late 70's and early 80's big cars and wagons. It has a 10 bolt cover and 12 bolts on the ring gear. And the one you have pictured there i'm guessing has 28 splines.
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98 Neon 97 Grand Prix GT 02 Grand Prix 40th Anniv. 86 GMC 5.0 77 Olds 98 6.6 REAL AMERICANS, DRIVE AMERICAN |
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10-19-2010, 11:43 PM
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#5 |
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60-66 Nut
  Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,246
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Re: How do I know this is the right posi unit?
If you can give me the measurement from the floor to the flange where the ring gear bolts as it sits in this pic. I'll compare that to a 4 series truck 12 bolt carrier I have at the shop.
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