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Additionally, several design changes have been made to increase the dura-bility of the original equipment cagedball bearings in all types of operatingconditions. The installation of sec-ondary dust shields to the axle(August 2000 vehicle production), andchanges to the wheel bearing itselfrepresent some of the results of thiscontinued study. The most recent pro-duction changes were:• Grease material changed,• Treatment changes to the rear ballbearing and inner race,• Initial preload applied in produc- tion changed. These changes took place effective August 21, 2001, starting with the fol-lowing VINs: • Impreza Sedan: 2*517136 • Impreza Wagon: 2*817579 • Forester: 2*735724 To reduce the possibility of repeat premature failures, Subaru has intro-duced a new procedure to service therear wheel bearings of the models listedabove that entails replacing the rearwheel bearing on the vehicle. This newprocedure eliminates the heavy forcesneeded to service the rear wheel bear-ings that occur when using a hydraulicpress. This smooth, low force installa-tion eliminates the chances of deform-ing the wheel bearing housing andincreases the efficiency of the repair.