Symptoms of a faulty automatic transmission torque converter:
Mechanical symptoms:
* Gearbox slippage
* Extraneous noise (grinding, squealing) when shifting gears or accelerating
* Vibration or jolting when the engine is running
* Transmission fluid overheating
*Transmission fluid leak
Performance related symptoms:
* Sluggish acceleration
* Difficulty engaging any gear
* Gear changes occur at higher or lower speeds than usual
* Deteriorating fuel economy
Visual symptoms:
* Metal shavings in transmission fluid
* Burnt smell from transmission fluid
* Worn or damaged surfaces on the torque converter
Electrical Symptoms:
* Error codes related to torque converter
* Faulty input or output shaft speed sensor
Other symptoms:
* Increasing engine speed without increasing vehicle speed
* Difficulty when towing or climbing slopes
* Unexpected transition to neutral position
* Transmission does not upshift