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Old 08-22-2012, 03:22 AM
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12 bolt gear options?

Hey everyone

I'm looking to change the gears in my GM 12 bolt passenger car rear end.
Its currently a 3.07 and I would like to go to a 3.90. However it looks like the highest I can go with the stock carrier is 3.73, is this correct? or do the aftermarket ring/pinion sets work with higher gear ratios?


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Old 08-22-2012, 04:39 AM
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Idk for the 12 bolt but for dana axle they sell thick gear sets to use the 3.73 down carrier. Im assuming they should to for the 12 bolt
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Old 08-22-2012, 05:55 AM
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The 3.07 fits a 3 series differential in the Chevy 12 bolt car rear end. You can go as far as a 4.88 on the 3 series with the thick after market gears. There are special thick 3.91, 4.11, 4.56 and 4.88 gears that fit the 3 series.
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