Internal signs:
* Gear shift delay or slippage
* Howling, humming or vibration when shifting gears
* Gearbox sticks or won’t engage
*Hot transmission fluid smell
External signs:
* Flashing or illuminated transmission check light
*Transmission fluid leak
* Stains under the car after parking
* Burnt transmission fluid smell
Other signs:
* Reducing vehicle traction
* Increased fuel consumption
*Increasing engine speed during gear changes
*Elevated transmission fluid temperature (can be checked with a thermometer)
Possible causes of overheating:
*Low transmission fluid level
* Contaminated transmission fluid
* Worn or damaged transmission components
* Problems with the cooling system
* Excessive load on the transmission (such as towing a heavy load)