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what year and size is your axle? 12bolt or 10bolt.All 10 bolts have a 30 spline pinion.It is the carrier that you want more spline count. Only the later model 1989-1991 10 bolts got 30 spline axle.Carrier break on a 10 bolt is 2.56 / 2.7312bolt truck axles all have 30 spline.Carrier break is 2.73 / 2.76 / 3.42 / 3.73