Possible causes of vibration when driving with an automatic transmission:
1. Transmission problems:
* Worn or damaged gearbox
* Torque converter malfunctions
* Cardan shaft failure
* CV joint malfunction
* Damage to the engine or transmission mount
2. Chassis problems:
* Wheel imbalance
* Faulty wheel bearings
*Bent or damaged wheel rim
* Insufficient tire pressure
3. Engine problems:
* Faulty spark plugs or injectors
* Damage to the exhaust manifold
* Unstable engine operation
4. Others:
* Incorrect brake adjustment
*Bearing rupture
* Play in steering
Diagnosis and troubleshooting:
1. Check the gearbox oil level: Low oil level can cause slipping and vibration.
2. Balance your wheels: This will eliminate imbalances that can cause vibration at certain speeds.
3. Check the wheel bearings: Worn or damaged bearings can cause humming and vibration.
4. Check the spark plugs and injectors: Faulty spark plugs or injectors can cause unstable engine operation resulting in vibration.
5. Check Engine and Transmission Mounts: Damaged or worn mounts may allow the engine or transmission to vibrate.
6. Check the driveshaft: A driveshaft with bad plugs or bearings may cause vibration.
7. Check the CV joint: A faulty CV joint can cause vibration when cornering or accelerating.
If the problem does not resolve after performing these checks, take it to a mechanic for further diagnosis.