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Old 08-03-2009, 06:20 AM   #6
Alan Roehrich
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Default Re: 12 Bolt Chevy problem

Never had a good pinion shim fail, unless the pinion nut is backing off, or not tight enough to begin with. It is also possible that the bearings are not getting enough preload. Ordinarily, it will kill the shims on the spacer before it hurts the shim on the pinion bearing.
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