Reasons for automatic transmission slipping while driving:
Problems with the valve body:
* Worn or dirty shift solenoids
*Low hydraulic fluid pressure
* Fluid leakage from valve body
Worn or broken friction discs:
*High mileage or extreme loads
* Lack or low quality of automatic transmission fluid
Problems with torque converter:
* Torque converter lock-up malfunction
* Overrunning clutch malfunction
Low level or dirty automatic transmission fluid:
* Insufficient fluid for lubrication and power transmission
* Contaminated fluid can create sediment and clog filters
Electrical problems:
* Faulty input or output shaft speed sensor
*Faulty Transmission Control Module (TCM)
Other reasons:
* Incorrect tire pressure
* Faulty flywheel
* Problems with driveshaft or axle shafts
Signs of automatic transmission slipping:
* Dips in acceleration or slipping when changing gears
* Increased fuel consumption
* Burnt oil smell or smoke
* Noises, vibrations or shocks when shifting gears