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This is the HPI Racing Gearbox Spacer Set for the WR8 and Bullet series.
Now you can increase the efficiency of your HPI WR8 or Bullet's differentials with this spacer set that consists of several extremely thin steel shims. Simply place these next to the big bearings on the differential outputs to space the ring gear closer or farther away from the pinion gear for better durability and drivetrain efficiency.
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