Automotive Technology/Diagnostics
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Listen to driver concern and road test the vehicle, every time.
Vibration, Harshness, and Noise
editAlways begin at the tires look for uneven wear.
Transmission Vibration and Noise
editVibration
editTransmission and torque converter are not usual culprits for vibration. Check brakes , bearings, joints first.
When it is the culprit, usually it's an unbalanced/poorly mounted torque converter or faulty output shaft.
Noise
editShould be directly connected to speed and conditions
Any condition with engine running points to the oil pump.
Noises based in a single gears relate to a band or clutch problem.