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Old 02-15-2013, 11:13 AM
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Probably should have replaced the whole differential instead of just replacing the gears. GM usually makes some changes in the differential case when they change the axle splines or other parts. There are several versions of cases for the 7.5 and 8.5 rear ends because of minor changes that GM made when they changed axle splines. You can not run 28 spline gears in a 26 spline case in the 7.5 and you can not run 30 spline gears in a 28 spline case in the 8.5. You can not run 30 spline gears from the '90 to '98 case in the 30 spline '99 to current case in the 8.5. I would say that the inside dimintions of the case are not the same between the 17 spline version and the 30 spline version. Do not run it without the thrust washers. The gears will eat into the case.
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