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Old 11-18-2012, 01:34 PM
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The car 12 bolt pinion is the same size as the 8.5 pinion. The truck 12 bolt pinion is smaller than both of them. The 8.5 ring gear is 3/8 inch smaller than the 12 bolt, the differential bearings are smaller and the 8.5 has 28 spline axles and the 12 bolt has 30 spline axles. The 8.5 can be upgraded to 30 spline axles easily.
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