GM Service Manual Online
For 1990-2009 cars only

Checks

Causes

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

    â€¢ Differential Carrier
    â€¢ Differential Side Gears
    â€¢ Gears worn or pitted
    â€¢ Thrust washer damage
    â€¢ Final Drive Gear Set
    â€¢ Final Drive Internal Gear
    â€¢ Worn, planet pinions or washers
    â€¢ Worn, tooth damage