Possible causes of vibration when reversing with an automatic transmission:
1. Problems with the planetary gearbox:
* Worn or damaged gears
*Low or contaminated transmission fluid
* Faulty planetary gears
2. Problems with the torque converter:
* Clogged or faulty filter
* Wear of friction clutches
* Damage to the impeller or housing
3. Malfunctions of the driveshaft or differential:
* Unbalanced driveshaft
* Worn or damaged spline joints
* Failure of bearings in differential
4. Brake problems:
* Parking brake jamming
* Wear of brake pads or discs
* Faulty calipers
5. Suspension problems:
* Worn engine or transmission mounts
* Faulty shock absorbers or springs
* Play in tie rods or ball joints
6. Other reasons:
* Malfunction of the electronic transmission control module (TCM)
* Broken or twisted electrical wires
*Low battery voltage
Diagnostics:
* Visual inspection for leaks or damage
* Scan error codes
* Checking the level and condition of the transmission fluid
* Diagnostics of driveshaft and differential
*Check brakes and suspension
Solution:
*Replacement or repair of faulty components
* Cleaning or replacing the torque converter filter
*Adjusting or replacing the parking brake cable
* Replacement of worn or damaged suspension parts
* TCM reprogramming or replacement
* Repair or replacement of electrical wiring
* Recharging or replacing the battery