Pinpoint Test M : Noise, Vibration, Harshness

• Whine noise 
  • Some vehicles equipped with a 10R80 transmission may exhibit a whine noise. This may occur at idle and while driving coming from the bell housing and front pan area of the transmission. The whine noise may become louder when at operating temperature and increases with higher engine RPM in the Park position. A small amount of whine noise is considered to be characteristic of the 10R80 transmission due to the offset gear drivetrain in the front support and has no effect on durability.

• 2WD - Clunk noise when shifting from Reverse to Drive or Drive to Reverse 
  • 2WD drive vehicles are equipped with an anti-ting washer between the transmission output shaft and the transmission output shaft flange. When the load on the driveshaft changes, like when shifting from Reverse to Drive, the anti-ting washer will absorb normal movement between the 2 components. If the component interface is dry, corroded, or otherwise sticky, then a slip/stick condition can result. A slip/stick condition produces more than normal forces on the anti-ting washer and may result in an objectionable clunk noise. A light coating of high temperature grease applied to both sides of the anti-ting washer and the entire transmission output shaft spline area will reduce the clunk noise down to a normal acceptable level.
  • To remove the transmission output shaft flange and grease the output shaft and anti-ting washer, REFER to: Output Shaft Seal .

• Noise 
  • Check the engine drive accessories, suspension, driveline components, CV joints and transmission for noise. REFER to: Noise, Vibration and Harshness (NVH) .

• Vibration 
  • Check the engine drive accessories, suspension, driveline components, CV joints and transmission for vibration. REFER to: Noise, Vibration and Harshness (NVH) .

Possible Sources 

• Slip/stick condition at the transmission output flange/anti-ting washer interface
• Engine drive accessories
• Suspension components
• Driveline components
• Transmission components

Diagnostic steps are not provided for this symptom or DTC. REFER to: Diagnostic Methods