12 bolt posi I.D. INFO HELP - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BCOWANWHEELS · 06-05-2007, 08:19 PM

I was going to swap the rear cover from a spare rear end onto my work truck ( 1971 12 bolt ) and when i removed the cover off my spare rear ( 1970 gmc w/leaf spring, 12 bolt ) the diff looks completely different than the open diff in my work truck. along with the cross pins for the spider gears it has 2 or 3 small pins that run between the carrier halfs and they have what looks like weights or something on them. is this a factory l/slip or posi . never seen one before. if it is i,am gonna swap it into my work truc 12 bolt. the rear covers are the same but the posi cover had a magnet from the factory on it inside. any help is appreciated. also if its a 3.08 gear ratio will my 3.73 gears work on it ?
bob

06-05-2007, 08:19 PM	#1
BCOWANWHEELS Registered User Join Date: Nov 2006 Location: KINGSPORT,TN. Posts: 3,035	12 bolt posi I.D. INFO HELP I was going to swap the rear cover from a spare rear end onto my work truck ( 1971 12 bolt ) and when i removed the cover off my spare rear ( 1970 gmc w/leaf spring, 12 bolt ) the diff looks completely different than the open diff in my work truck. along with the cross pins for the spider gears it has 2 or 3 small pins that run between the carrier halfs and they have what looks like weights or something on them. is this a factory l/slip or posi . never seen one before. if it is i,am gonna swap it into my work truc 12 bolt. the rear covers are the same but the posi cover had a magnet from the factory on it inside. any help is appreciated. also if its a 3.08 gear ratio will my 3.73 gears work on it ? bob Last edited by BCOWANWHEELS; 06-05-2007 at 08:20 PM.



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