For 1990-2009 cars

#### RPM Sensitive Whine

Checks | Action
--- | ---
DEFINITION: In All Ranges: a whine which may be sensitive to RPM load, or which ceases when the TCC engages
Torque Converter (55) | Verify that the noise is internal to the torque converter by placing your left foot on the brake with the gear or selector in Drive. Momentarily stall the engine. Torque Converter noise increases under load.

#### High Pitch Whine

Checks | Action
--- | ---
DEFINITION: A high pitch whine which will intensify with engine RPM or which is sensitive to the oil pressure
Oil Pump System | Verify that the noise is internal to the oil pump during a preliminary oil pressure check. An increase in line pressure will vary an oil pump noise.

#### Popping

Checks | Action
--- | ---
DEFINITION: A Popping noise, similar to popcorn popping
Oil Pump System |

• | Inspect for pump cavitation, indicated by bubbles in fluid

• | Inspect the transmission fluid filter for a leaky seam

• | Inspect the transmission fluid filter seal for improper positioning or for a cut seal

#### Buzz or High Frequency Rattle

Checks | Action
--- | ---
DEFINITION: A Buzz or High Frequency Rattle

• | Trace Cooler Pipes

• | Inspect for binding or contact at the radiator, other than at the cooler pipe connectors.

Verify a pressure buzz by watching for a needle vibration of the pressure gage. A road test may be necessary. Refer to Road Test .

#### Whine or Growl

Checks | Action
--- | ---
DEFINITION: A Whine or Growl that increases and fades with vehicle speed and is most noticeable under light acceleration
Drive Link Assembly System | Verify that the noise comes from the sprockets or the from the drive ink assembly, chain, by placing your left foot on the brake and by moving the gear selector from Park or Reverse. If the noise stops, check the following items.
Drive Chain (36) | Stretched
Drive Sprocket (37) and Driven Sprocket (91) |

• | Broken or sheared teeth

• | Nicked or scored bearing surfaces

• | The bearing race or roller bearing surfaces on the gear support inner bearing are rough or pitted

• | A damaged bearing

Drive Sprocket Support (43) and Driven Sprocket Support (95) | The bearing outer race support is rough or nicked

#### Final Drive Hum

Checks | Action
--- | ---
DEFINITION: A Final Drive Noise or Hum is most noticeable under light throttle acceleration or turns

• | Final Drive Gear Set (116)

• | Final Drive Internal Gear (118)

• | Worn planet pinions

• | Worn washers

• | Worn or damaged teeth

• | Differential Carrier (116)

• | Differential Side Gears (709)

• | Worn or pitted gears

• | A damaged thrust washer

#### Forward Ranges

Checks | Action
--- | ---
DEFINITION: Noise in 1st, 2nd, 3rd, or 4th

• | Final Drive Sun Gear (115)

• | Final Drive Pinions (707)

Worn or damaged gears

#### Random Ranges

Checks | Action
--- | ---
DEFINITION: Noise only in certain gear ranges
Refer to Range Reference . Determine the power flow and the applicable components that may be causing this noise.