Features redesigned internals to eliminate the problems with the factory OPDA. Factory OPDA had a seal under the upper bearing which caused the bearing to fail prematurely. |Crowns OPDA has the seal relocated to above the upper bearing and an oil groove in the shaft of the OPDA which is designed to bring oil up to both the upper and lower bearings.||Crown Automotive carries over 9500 unique quality replacement parts encompassing over 766,000 different applications for every model of Jeep produced since 1941.