NISSAN 38120-76560 Rear Pinion Bearing

The genuine Nissan (SKU: 38120-76560) rear pinion bearing (BRG PINION REAR) is one of the most critical structural components of the vehicle's differential. Its function is to provide precise radial and axial guidance for the pinion shaft, ensuring optimal tooth contact between the pinion and ring gear in the drivetrain.

Technical Features and Role

The rear pinion bearing is directly exposed to substantial axial and radial forces originating from the drivetrain. This precision-manufactured rolling bearing provides minimal frictional resistance and maximum service life even under high rotational speeds and extreme loads.

• Genuine Part Number (OEM): 38120-76560
• Interchange / Alternative Part Numbers: 38120-76510
• Part Type: Rear Pinion Bearing
• Manufacturer: NISSAN (Genuine OEM Part)

Function and Importance of the Pinion Bearing

Within the differential, the pinion bearings precisely locate the drive pinion. If a bearing wears out, axial or radial play increases, altering the backlash where it meshes with the ring gear. This can cause premature gear tooth wear, chipped or broken teeth, and ultimately complete differential failure.

Typical Symptoms of Failure

Wear or damage to the rear pinion bearing may be indicated by the following signs:

• Humming, growling noise: A roaring sound from the rear axle under load (during acceleration or engine braking) that increases proportionally with vehicle speed.
• Metallic grinding noise: Continuous noise caused by severe wear or bearing raceway surface damage (pitting).
• Oil leak: Excessive pinion shaft play can degrade the pinion oil seal, resulting in differential oil leakage.
• Free play at the driveshaft: Noticeable manual radial or axial play at the propeller shaft/flange connection.