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 25BONUS Installs on shocks to increase CORCC0006 Color:High Definition Blue Includes Valve Stem Adapter 11004B-DB
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