Gears slip:
* Wear of friction linings
* Clogged filters
*Low transmission fluid level
* Air in the system
* Faulty solenoids or pressure control valve
Difficulty shifting gears:
* Clogged pressure control valve
* Faulty solenoids
* Slipping of friction linings
* Hydraulic pump wear
Vibrations and noise:
* Bearing wear
* Torque converter imbalance
* Wear of pump bushings
* Turbine coupling wear
Overheat:
*Low transmission fluid level
* Cooling system clogged
* Faulty hydraulic pump
* Slipping of friction linings
Leaks:
* Damaged seals or gaskets
* Cracks in the transmission housing
* Malfunction of torque converter oil seal
Other faults:
* Wear of turbine blades
* Faulty vibration damper
*Damage to torque converter housing