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.

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.

DEFINITION: A Popping noise, similar to popcorn popping

Oil Pump System

DEFINITION: A Buzz or High Frequency Rattle

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

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)

Drive Sprocket Support (43) and Driven Sprocket Support (95)

The bearing outer race support is rough or nicked

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

DEFINITION: Noise in 1st, 2nd, 3rd, or 4th

Worn or damaged gears

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.