GM Service Manual Online
For 1990-2009 cars only

Final Drive Noise or Hum Noise

Checks

Cause

DEFINITION: A final drive noise or hum is most noticeable under light throttle acceleration or turns

    â€¢ Final Drive Gear Set (700)
    â€¢ Final Drive Internal Gear (693)
    â€¢ Worn planet pinions
    â€¢ Worn washers
    â€¢ Worn or damaged teeth
    â€¢ Differential Carrier (700)
    â€¢ Differential Side Gears (705)
    â€¢ Worn or pitted gears
    â€¢ A damaged thrust washer