General signs:
* Noises and hum while driving
* Vibration when accelerating or driving at speed
* Slipping or failure to transmit torque to the wheels
* Difficult turns
* Increased fuel consumption
Specific signs of a faulty automatic transmission differential:
Excessive noise and vibration:
* Noise resembling a hum or howl, increasing with speed
* Vibration felt through the steering wheel, seat or pedals
Slipping or lack of torque transmission:
* Slipping of one or both wheels during acceleration or cornering
* Refusal of the car to move away or move at speed
* Car sliding to one side when cornering
Difficult turns:
* Effort when turning the steering wheel
* Feeling stuck or jerking when turning
* Grinding or crunching noise when turning
Other signs:
*Transmission fluid leak
*Transmission overheating
Causes of automatic transmission differential malfunction:
*Normal wear and tear
* Insufficient transmission fluid level
* Transmission fluid contamination
* Incorrect differential adjustment
* Mechanical damage