Detroit Locker 187C149A Differential Locker with 28 Spline for GM 8.5'', 10 Bolt Rear End by Detroit Locker at Cheap Auto Glass. MPN: 187C149A. Hurry! Limited time offer. Offer valid only while supplies last. Detroit Locker Differential1971-91 GM Car/Truck 28-Spline Axles 8.5'' Diameter Ring Gear Fits 2.73 & Up Gear Ratios Note: Requires the use of spool bearing kit part number 873-D1585.1971-91 GM Car/Truck. 28-Spline Axles. 8.5'' Diameter Ring Gear. Fits 2.73 & Up Gear Ratios Note: Requires the use of spool bearing kit part number 873-D1585..
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