External signs:
* Gear Slip: The transmission slips when changing gears, especially when going uphill or under load.
* Noise or Vibration: Unusual noise or vibration, especially when shifting gears.
* Oil Leak: Transmission fluid may begin to leak, causing low fluid levels and damage.
* Shift Delay: The transmission is slow to shift gears, resulting in sluggish acceleration and jerking.
Internal signs:
* Clutch wear: The clutches in the torque converter can wear out, reducing the torque delivered.
* Pump Damage: The torque converter pump can fail, causing loss of fluid pressure and slipping gears.
* Clogged passages: The passages through which transmission fluid circulates can become clogged, preventing pressure transfer and causing slippage.
* Filter Clogged: The torque converter filter can become clogged, resulting in reduced fluid flow and component damage.
Other signs:
* Engine Trouble Codes: The engine management system may record trouble codes related to torque converter malfunctions.
* Strange smell: When friction linings burn, a specific burning smell may appear.
*Transmission Overheating: A faulty torque converter can cause the transmission to overheat, which can lead to further damage.