Possible causes of vibration when engaging a gear in an Opel automatic transmission:
1. Torque converter malfunction:
* Wear of friction linings
* Damage to turbine or pump blades
* Clogged oil filter
2. Transmission faults:
* Worn or damaged planetary gears
* Defective input shaft
* Destroyed bearings
3. Engine malfunction:
*Low oil pressure
* Inadequate fuel supply
* Damage to engine mounts
4. Drive system malfunctions:
* Worn or damaged driveshafts
* Unbalanced wheels or tires
* Broken or damaged axle shaft
5. Problems with electronics:
* Faulty speed sensors
* Solenoid valves
* Electronic transmission control unit
6. Suspension faults:
* Worn shock absorbers or struts
* Loose or damaged silent blocks
* Worn or damaged rubber bushings
7. Other possible reasons:
* Insufficient transmission fluid level
* Contaminated transmission fluid
* Incorrect engine and transmission alignment
Diagnosis and elimination:
1. Check the level and condition of the transmission fluid.
2. Scan trouble codes using a diagnostic scanner.
3. Check the external condition of the transmission for leaks or damage.
4. Inspect the driveshafts, axle shafts, and outboard bearings.
5. Take a test drive and pay attention to the behavior of the transmission when changing gears.
6. If the problem is electronics or motor related, additional diagnostics will be required.
Notes:
* Vibration when shifting into gear may also indicate a serious problem with the transmission or engine.
*Do not ignore vibration as it may cause further damage and costly repairs.
*Always have your automatic transmission problems diagnosed and repaired by a qualified mechanic.