Possible causes of vibration in the cabin with an automatic transmission:
1. Transmission problems:
*Low or contaminated transmission fluid
* Wear of friction discs
* Torque converter malfunction
* Cardan shaft failure
2. Engine problems:
* Unbalanced flywheel
*Damaged engine mounts
* Problems with ignition or fuel supply
3. Problems with wheels and suspension:
* Unbalanced or deformed tires
* Faulty shock absorbers or struts
* Wheel bearing wear
4. Other reasons:
* Exhaust system has fallen off or is touching other components
* Worn generator drive shaft
* Cooling system malfunction leading to engine overheating
Diagnostics:
To diagnose the cause of vibration, you must:
* Check the level and condition of the transmission fluid.
* Inspect the engine for obvious problems or leaks.
* Raise the vehicle and check the suspension, tires and exhaust system.
* Check the cooling system to ensure there is no overheating.
Repair:
Once the cause of the vibration has been identified, repairs must be made. This may include:
* Transmission fluid replacement or transmission repair
* Engine repair or replacement
* Tire balancing or replacement
* Replacing shock absorbers or struts
* Elimination of problems with the exhaust system
If vibration continues after repair, it is recommended that you contact an experienced mechanic for further diagnosis and repair.