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Old 06-24-2007, 10:01 PM   #1
Knothead
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12 bolt posi ID

I purchased a 6 lug rearend supposedly out of 65-66 chevy truck. the ring gear is a 12 bolt,3.73 ratio. I'm having ahard time determining what type posi unit it is.Casting numbers on the housing are 3856525
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Old 06-24-2007, 10:51 PM   #2
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Re: 12 bolt posi ID

what makes you think it is a posi.. If you open the inspection plate you will be able to see if it is a posi or not.. But then again if you already did that then you know...
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Old 06-25-2007, 12:46 AM   #3
PrerunnerRob
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Re: 12 bolt posi ID

2 spider gears or a sping type unit inside the carrier?
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Old 06-25-2007, 09:04 AM   #4
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Re: 12 bolt posi ID

Hope the pics help
Attached Images
  

Last edited by Knothead; 06-25-2007 at 09:48 AM. Reason: no pictures
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Old 06-25-2007, 09:40 AM   #5
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Re: 12 bolt posi ID

There are no pictures. Scroll down to manage attachments and post pictures that way..
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Old 06-25-2007, 10:00 AM   #6
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Re: 12 bolt posi ID

I edited previous post
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Old 07-07-2007, 11:55 PM   #7
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Re: 12 bolt posi ID

Can you tell what type of rear end just by looking at it ? Don't the covers vary? If so does anyone know what to look for?
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Old 07-09-2007, 09:43 AM   #8
jchav62
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Re: 12 bolt posi ID

Put the unit on jack stands or something. Turn the axle, if both sides turn the same direction its posi, if they turn opposite of eachother, its not.
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Old 07-09-2007, 10:43 AM   #9
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Re: 12 bolt posi ID

somethings weird about my rear end. when i was changing the rear brakes i turned one side and the other turned the opposite direction so i know its not posi. but when the tires spin the both turn every time. weird.
John
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