While tightening the pinion nut, the crush sleeve compresses to allow the bearings to preload slightly. Too much bearing preload will quickly overheat and cause bearing failure when driven, and too little preload may not allow the bearings to ride properly in the bearing races causing wear and potential failure. If you have questions on this or other differential parts call us at 800-869-7030 or visit us at www.accuautoparts.com

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