For sale is an Eaton # 19556-O1O four series posi carrier for the Chevy 12 bolt truck rear ends using 30 spline axle shafts. This unit had bearings pressed on and looks like a couple ring gear bolts tightened up. Yet has NEVER been run in a vehicle. The assembly grease is still present around the clutch guides This unit has a date stamp from March 2008 and is available as pictured for $450