Thread: 4x4 12 bolt
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Old 07-27-2010, 04:29 AM   #1
nbpro
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Join Date: Dec 2008
Location: Huntsville,AL
Posts: 2,119
Question 4x4 12 bolt
1987 chevy 4x4 12 bolt rear end with 3.73 gears with 31 spine axles

swap in to a 1981 gmc with a 305 engine. 10 bolt 2.56 gears th350c transmissions
Last edited by nbpro; 07-27-2010 at 04:33 AM. Reason: add more info
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