Eaton Posi Performance Differential - GM 8.5" 10 Bolt, 1971-89 GM Passenger Car - 28 Spline, 1.20" Axle Diameter - 2.73 Ratio and Up Large Gauge cup depth only 39703 Size:Small (48) 6 Head Bolt Design GMP19170419
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Ships within 48 hours · Estimated delivery Oct 8 - Oct 13