* Mechanical components:
* Worn or damaged gears and bearings
* Malfunction of the planetary gear mechanism
* Failure of friction lining of clutches
*Hydraulic components:
*Leaks in hydraulic lines
* Faulty transmission fluid pump
* Worn or clogged solenoids
* Other:
* Insufficient transmission fluid level
* Contaminated transmission fluid
*Damaged or worn transmission modulator vacuum line
* Faulty speed sensor
