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Up for sale is a mint rebuilt O type 588 Posi Carrier. Correct posi for GM 3.42, 3.91, 4.33, 4.66 gearsets. This unit was blasted, inspected, good GM clutches, reshimed and new S spring. It's ready to install once you press on your bearings. You can use this with Richmond gears as well but you need to trim the posi face in a brake lathe. $800 shipped.