Possible causes of vibration when engaging a gear in a Mercedes automatic transmission:
Transmission problems:
* Worn or damaged friction discs
* Faulty torque converter
*Low transmission fluid level
* Contaminated transmission fluid
* Faulty shift solenoids
Engine problems:
* Worn or dirty spark plugs
* Faulty ignition coils
* Clogged fuel filter
* Faulty crankshaft position sensor
* Faulty engine management system
Mounting problems:
* Loose engine or transmission mounts
* Faulty outboard bearings
* Worn driveshafts
Problems with tires and wheels:
* Unbalanced tires
* Deformed tires
*Low tire pressure
* Incorrect wheel alignment
Other reasons:
*Dirty air filter
* Poor quality fuel
*Wiring problems
Solutions:
* Check the level and condition of the transmission fluid. Replace fluid if necessary.
* Inspect the transmission for leaks or damage.
* Perform computer diagnostics to identify faulty transmission, engine or wiring components.
* Replace worn or damaged parts.
* Repair or replace faulty supports or fastenings.
* Balance or replace tires, adjust wheel alignment.
* Replace the air filter and use quality fuel.
*Consult an authorized Mercedes service center for professional diagnosis and repair.