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Classic Truck Discussion Board

12 bolt diff..

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Posted by 68c10lwb on March 25, 2005 at 05:40:14 from (

ok so i've got a 12 bolt gm rear and im trying to buy a ring and pinion gear. everyone ask's me is it 3" or 4" carrier. what do i measure to determin this... or is there another way to tell with out dissassembly? thanks in advace for any input that you guys have...

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