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12 bolt posi ID

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06-24-2007, 10:01 PM	#1
Knothead Registered User Join Date: Mar 2007 Location: south carolina Posts: 251	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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