Abnormal noise (at normal condition)

Probable Cause 

• Gear noise
• • -

    Poor gear mesh between ring gear and drive pinion

  • -

    Hypoid gear (wear or damage)

  • -

    Poor pre-road (drive pinion)

  • -

    Debris in hypoid gear area

  • -

    Fluid level too low

  • -

    Distortion of the differential carrier case

• Bearing noise
• • -

    Bearing (wear or damage)

  • -

    Drive pinion taper bearing (wear)

  • -

    Debris in bearing

• Pump noise (at lubrication)
• • -

    Debris in pump

  • -

    Rotor (wear or damage)

• Loose or missed torqued parts

Remedy 

Do the symptom troubleshooting for abnormal noise