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Rear Inner Differential Pinion Bearing (WTHM89449) by WJB®. When it comes to a top-notch replacement for your worn out factory part, this OE-quality differential component is right what the doctor ordered if you need to restore and maintain your vehicle running in its finest condition. Designed to fit and function the same as OE, this reliable part will direct torque to the drive wheels and make them rotate at the different speeds as they should, making cornering smooth and easy again.