Thread: gm 12 bolt rear
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Old 11-12-2009, 10:22 PM
  #3  
cepx111
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Join Date: May 2006
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You can pull the cover, count the ring gear teeth, divide that number into the pinion teeth.
Ball park ratio.

E.G ---> 39/7 = 5.571429 or what is commonly refered to as a 5.57 gear
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