The wear and tear from the engine mileage and oil breakdown can each contribute to the early breakdown of various components including gearbox. Transmission problems are common with both new and pre owned vehicles. Repairing a gearbox can get really expensive if the problem was not identified at early stages. The owner or the driver should look out for warning signs that indicate that the car is at the verge of having gearbox problems and immediately call in transmission repair NJ service to fix it.