Final Drive Noise or Hum Under Light Throttle. Pontiac Sunfire 2001

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 2001 🢒 Sunfire 🢒 Transmission/Transaxle 🢒 Automatic Transaxle - 3T40 🢒 Final Drive Noise or Hum Under Light Throttle

Checks

Cause

Noise may occur in First, Second, or Third

Final Drive Internal Gear (673)

•	Gears are worn or pitted

•	The thrust washer or the thrust bearing mating surfaces are rough or pitted

Differential Carrier (678)

Worn thrust bearing surfaces

Final Drive Sun Gear (675)

•	Gears are worn or pitted

•	The thrust washer or the thrust bearing mating surfaces are rough or pitted

Differential Pinions (816)

•	Pinions are worn or pitted

•	The thrust washer or the thrust bearing mating surfaces are rough or pitted

Differential Side Gears (687)

•	Gears are worn or pitted

•	The thrust washer or the thrust bearing mating surfaces are rough or pitted

Final Drive Sun Gear to Final Drive Internal Gear Thrust Bearing (676)

Thrust bearing races or roller bearing surfaces are rough or pitted

Final Drive Sun Gear to Differential Carrier Thrust Bearing (674)

Thrust bearing races or roller bearing surfaces are rough or pitted

Differential Carrier to Case thrust Bearing (681)

Thrust bearing races or roller bearing surfaces are rough or pitted